小数加减法专项练习题有答案ok0002

1、小数加减法专项练习200题（有答案）(1) 7.4+12.86(10) 12.42+0.48(2) 20-5.674(11) 0.56+11.534(3) 141.2 -48.98(12) 44- 22.13(4) 102+4.36(13) 91 - 22.035(5) 32.15 -27.45(14) 52.6+21.237(6) 12.9+5.01(15) 9.15 -2.18(7) 29.46 ( 9.46+3.8 )(16) 3.85 - 1.5+1.32 ,(17) 15.4+6.87(8) 15.75+0.65 - 2.75+3.35(20) 123.56 -47.9+51.7(3

2、0) 57.5 -3.25 16.75 ,(21) 2.7+3.1+2.9+3.2 ,(31) 6.02+3.6+1.98(22) 28.42+19.48(32) 1.29+3.7+2.71+6.3(23) 42.56+3.124(33) 3.07 -0.38 1.62(24) 81 - 30.75(34) 3.25+1.79 -0.59+1.75(25) 15.6 十 0.237(35) 7.5+4.9 -6.1(26) 148.2 -25.62 - 24.38(36) 14.8+7.9 -4.8(27) 4.52 -0.74 -0.26(37) 2.608+2.84(28) 0.42+5.

3、4+1.58+2.6(38) 6.07 - 3.869(40) 76.8+26.82(50) 17.17 6.8 -3.2 -6.17(41) 102.07 - 37.257(51) 73.8 - 1.64 - 13.8 -5.36(42) 48.64+18.6(52) 6.75 (0.9+3.75 )(43) 54.75 -5.25 14.75 ,(53) 27.38 - 5.34+2.62 -4.66(44) 4.68+14.79+5.32 - 10.79,(54) 35.72 -4.9 - (5.72+5.1 )(45) 48.9 12.7 -0.3 ,(55) 0.73 -0.25 -

4、 0.73+0.25(46) 56.4 - 39.7+24.3 ,(56) 5.3+0.1+5.3 - 0.1(47) 3.6 2.8+3.4 7.2 ,(57) 12.7 -4.8 -5.2 .(48) 3.67+18.5+6.33 ,(58) 23.25 6.75 3.25(60) 9.05 -3.86 -3.14(70) 270-42.5 17.5(61) 20-9.18 -0.82(71) 15.68 - (7.78 4.32) 2.32,(62) 6.53 ( 1.53+2.6 )(72) 0.9+9.9+99.9+999.9 ,(63) 5.52 1.074 0.926(73) 2

5、5.46 8.23 - 1.76 ,(74) 9.4+0.3 6.4,(64) 4.21+1.04+0.79(65) 1.36+4.85+2.64+6.15(75) 15.25+4.72+4.75+5.28 ,(66) 83.7 12.83 -0.17(76) 34.823 (4.82+15.2 ),(67) 4.32+5.43+6.68(77) 12.7 -4.8 -5.2 ,(68) 17.17 -6.8 -3.2 ,(78) 3.1+25.78+6.9 ,(80) 2.15+8.73+1.27+7.85(90) 15.17 (3.6+4.9 ),(81) 11.87 (8.2+1.87

6、),(91) 35.6+ (12.6 -4.4),(82) 5.42 -3.87 1.13 ,(92) 16.4+3.5+83.6+166.5(93) 4.65 -2.55 - 1.45,(83) 4.38 - 1.56+0.62 0.44 ,(84) 46.7 15.03 -4.97(94) 1.28+0.86+38.72 ,(85) 4.52+0.61+1.39+6.48(95) 25.74 3.57 6.43 ,(86) 4.27 ( 1.96 - 1.73)(96) 14.5 -4.68 -5.32 ,(87) 7.27 ( 1.98+0.27 ),(97) 0.485+0.64+3.

7、36 ,(88) 13.7+8.65 - 9.628,(98) 72.51 9.34 12.66 ,(100) 5.76+2.43+0.24+10.57 ,(110) 27.73 (4.73 - 1.85),(101) 9.28 (3.28+2.55 ),(111) 3.84+26.5 (20- 8.6),(102) 9.5+4.85 6.13,(112) 7.38 5.14+3.62 -2.86 ,(103) 10.75 - 1.86 - 2.75 -3.16 ,(113) 5.86+13.08 9.27 ,(104) 1.3+0.94+0.06+7.7 ,(114) 25.4 - ( 15

8、.4 -6.4),(105) 4.45+0.63+5.55 ,(115) 47.23 -7.23 -5.89 ,(106) 45.5 (0.98+5.5 ),(116) 4.45+0.63+5.55 ,(117) 5.28 (2.9+1.28 ),(107) 0.96 - 0.28+0.04 -0.72 ,(108) 12.7+12.5+0.5 ,(118) 5.25+7.86 - 2.86+4.75 ,(120) 9.42+7.39+1.58 ,(130) 4.26+5.48 - 1.26+4.52 ,(121) 18.4 -1.6 -5.4 ,(131) 14.67+25.91+15.33

9、+4.09 ,(122) 75.7+39.4 - 23.86 ,(132) 10.75 - (2.4 0.86),(123) 21.21+38.38 - 9.79,(133) 9.61 - 4.38+0.35 ,(124) 47.28+1.39+52.72 ,(134) 3.87+4.92+1.13 ,(125) 2.45 - 1.68+1.54 ,(135) 46.24 -8.66 - 1.34 ,(126) 15- 8.13 1.87,(136) 21.9 9.22 0.78+8.1 ,(127) 5.14+3.225 6.302,(137) 35.47+39.88 12.37 ,(128

10、) 3.95+5.36 - 1.95 ,(138) 93.21 -5.99 14.01 ,(150) 1.3+2.83+8.7+0.17 ,(140) 42.37 ( 12.37 9.78),(151) 2.47 2.2 - 3.8+7.53 ,(141) 38.78 - 19.59+41.22 - 30.41 ,(142) 1.9+19.9+199.9+0.3(152) 6.89+4.7+2.11+5.3 ,(143) 429+31.1+2.04 ,(153) 7.46 2.37 - 1.63,(144) 100-27.2 -42.8 ,(154) 14- (3.65+0.24 ),(145

11、) 9- (3.02+1.25 ),(155) 70.8 - 1.25 - 1.75 ,(146) 1.8 - 1.57+0.2 ,(156) 5.81+8.3+4.19+11.7 ,(147) 5.03 - 2.5+0.96 ,(157) 4.2+7.64+5.8+2.36 ,(148) 35.72 ( 5.9+5.72 ),(158) 14.28 2.63 7.37,4.7+7.69+5.3+2.31 ,53.78 13.6 - 37.4+6.22 ,60- (21.5 8.8) +7.3,9.5+4.85 -6.13 ,75.8 - ( 15.3 -4.8),51.27 -8.66 -

12、1.34 ,28.4 3.96 1.04+4.6 ,70.8 7.25 1.755.81+8.3+4.19+11.7(160) 6.21 - 3.8+2.2 ,(170)(161) 6.03+3.7+2.97 ,(171)(162) 17.43 - 6.57 - 2.43,(172)(163) 20.47 - ( 1.47+6.8 ),(173)(164) 13.26+4.71+3.47+5.29 ,(174)(165) 22.74+8.68 - 13.74,(175)(166) 12.56 -6.64 - 3.36,(176)(167) 45.5 - (0.98+5.5 ),(177)(16

13、8) 13.6+7.94+6.4 ,(178)(180) 6756- 193 207,(190) 11.72 -7.85 - ( 1.26+0.46 ),(181) 0.9+1.08+0.92+0.1 ,(191) 15.37+28.44+12.56 ,(182) 13.59 - 6.91 0.09,(192) 12.64 - (3.96+4.64 ),(193) 36.26 - 4.78+3.74 ,(183) 4.58+3.38+ (5.48+6.62 )(184) 73.75 - (4.3+8.75 )(194) 7.34+7.57+12.66+6.43 ,(185) 5- (4.19

14、-2.83),(195) 78.65 23.12 14.88,(186) 1.39+0.72+0.61+3.28 ,(195) 4.58+2.39+ (5.42+7.61 ),(187) 8-3.7 -6.3 ,(196) 8.27+5.84+1.73+2.16 ,(188) 8.28 - (1.28+3.7 ),(197) 18.51 -9.08 -0.92 ,.(199) 7.85+6.76+2.15(209) 3.78 1.46+1.54 ,(200) 18.43 - 3.76 - 7.24(210) 8.45 - (5.45+2.98 );,(201) 21.65+ (4.8 - 3.

15、65)(211) 3.01+8.2+6.99+1.8 ,(202) 9.64 (4.64 - 1.23)(212) 4.3 (5.98 - 5.7 ),(203) 2.7+17.6+3.3 -5.6(213) 5.52 0.55 0.45 ,(204) 9.87 -3.5+2.13 8.5(214) 19.6 - 26.72+80.4 - 3.28 ,(205) 5.64+4.97+0.03 ,(215) 27.5 10.8 0.2 ,(216) 43.5+18 - 13.5 ,(206) 10.93 3.74 4.26,(207) 10- 6.8 -3.2 ,(217) 63.5 - (43

16、.5+20),(219) 12.56 6.64 3.36 ,(225) 32.63+7.89 6.4 ,(220) 45.5 (0.98+5.5 ),(226) 3.97+0.7 - 1.32,(221) 6+7.94+6.4 ,(227) 30- (3.8+0.75 ),(222) 5.41+3.46 -2.46 ,(228) 75.6 - ( 14.3 - 8.3 ),(223) 2.03 -0.18 - 2.82+7.97 ,参考答案：(1) 7.4+12.86=20.26 ;7.4+ 12 8620.26(2) 20-5.674=14.326;20-£67414326(3)

17、141.2 - 48.98=92.22 ;141.2-4S.9892.22(4) 102+4.36=106.36; 102+ 4.3610636(5) 32.15 - 27.45=4.7 ;32.15-27.454.7验算： 27.45十4.732.15(6) 12.9+5.01=17.91 ;12.9 5.0117.91 验算：17 91-5.01 -(7) 29.46 - ( 9.46+3.8 ), =29.46 - 9.46 - 3.8 , =20- 3.8 , =16.2 ;(8) 15.75+0.65 - 2.75+3.35 ,=(15.75 -2.75) + (0.65+3.35

18、), =13+4, =17;(9) 65.71 -4.99 ,=65.71 - (5-0.01 ),=65.71 - 5+0.01 ,=60.71+0.01 ,=60.72 ;(10) 12.42+0.48=12.9 ,(11) 0.56+11.534=12.094 ,(12) 44- 22.13=21.87 ,44-22.132L 87(13) 91 - 22.035=68.965 ,91-22. 03568. 965(14) 52.6+21.237=73.837 ,52.6+ 21.23773. 837(15) 9.15 -2.18=6.97 .9.15-2.186.9T(16) 3.85

19、 - 1.5+1.32 ,=2.35+1.32 ,=3.67;(17) 15.4+6.87=22.271 5.4+6.8 72 2. 2 7验算：2 2.2 7-1 5.46.8 7(18) 3.56+27.84=31.43. 5 6+ 2 7.8 43 1.4 0验算：3 1.4-2 748 435 5(19) 100-82.13=17.87I 0 0-8 2, 1 31 7.3 7验算：1 7. E 74- 8 2. 1 31 0 0.0 0(20) 123.56 -47.9+51.7=127.361 2 3.5 6-4 7, 97 5.65+5 1.71 2 7. 3 5验算：1 2 7

20、.3 6-5 1.7T 5. 6 6+4 7. 91 2 3. 5 6(21) 2.7+3.1+2.9+3.2 , =2.7+ (3.1+2.9 ) +3.2 , =2.7+6+3.2 , =11.9 .(22) 28.42+19.48=47.92 8. 4 2 十 1 9.4 B4 7. 9 0验算：4-9-2 9, 4 21 9. 4 0(23) 42.56+3.124=45.6844 2. 5 6+3,1 2 44 5*6 B 4验算：4 5. 9 B 43, 1 2 4-30.75=50.2555 0. 2 5验算：5 Q. 2 5+ 3 0. 7 58 1.0 0(25) 15.6

21、+ 0.237=15.8371 5. 6十 0. 2 3 72 5. 8 3 7验算：1 5, 8 3 7-1 5. 60. 2 3 7(26) 148.2 -25.62 - 24.38 =148.2 - (25.62+24.38 ),=148.2 -50,=98.2 .(27) 4.52 -0.74 -0.26=4.52 - ( 0.74+0.26 )=4.52 - 1=3.52 ;(28) 0.42+5.4+1.58+2.6=(0.42+1.58 ) + (5.4+2.6 )=2+8=10;(29) 5.9+28.65 - 16.57=17.98;2 8. 6 5+5.93 4. 5一 5

22、-1 6. 5 71 9 8(30) 57.5 -3.25 - 16.75 ,=57.5 - (3.25+16.75 ),=57.5 - 20,=37.5;(31) 6.02+3.6+1.98=6.02+1.98+3.6 ,=8+3.6,=11.6;(32) 1.29+3.7+2.71+6.3=(1.29+2.71 ) + (3.7+6.3 ),=4+10,=14;(33) 3.07 -0.38 - 1.62=3.07 - (0.38+1.62 ),=3.07 - 2,=1.07;(34) 3.25+1.79 -0.59+1.75=(3.25+1.75 ) + (1.79 -0.59),=5+

23、1.2,=6.2 ;(35) 7.5+4.9 -6.1=12.4 - 6.1 ,=6.3 ;(36) 14.8+7.9 -4.8=14.8 - 4.8+7.9 ,=10+7.9=17.9(37) 2.608+2.84=5.448 ,2. 608+ 2. 84448(38) 6.07 - 3.869=2.201 ,6.07-3, 8692. 201(39) 1.5 - 0.306=1.194,L5-0.3061.194(40) 76.8+26.82=103.62 ,76.8+ 26. 82103/62(41) 102.07 - 37.257=64.813 ,102. 07-37.25764. 8

24、13(42) 48.64+18.6=67.24 .48. 64+ 18. 667. 24(43) 54.75 -5.25 - 14.75 ,=54.75 - ( 14.75+5.25 ),=54.75 - 20,=34.75 ;(44) 4.68+14.79+5.32 - 10.79,= (4.68+5.32 ) + (14.79 - 10.79),=10+4,=14;(45) 48.9 - 12.7 -0.3 ,=48.9 - (12.7+0.3),=48.9 - 13,=35.9 ;(46) 56.4 - 39.7+24.3 ,=16.7+24.3 ,=41;(47) 3.6 - 2.8+

25、3.4 - 7.2 ,=(3.6+13.4 ) 2( 2.8+7.2 ),=17- 10,=7；(48) 3.67+18.5+6.33 ,=(3.67+6.33 ) +18.5,=10+18.5 ,=28.5 ;(49) 120- 17.83 -2.17 ,=120- 17.83 -2.17 ,=120- ( 17.83+2.17 ),=120-20,=100;(50) 17.17 -6.8 -3.2 6.17=(17.17 - 6.17) - ( 6.8+3.2 ), = 11-10,=1；(51) 73.8 - 1.64 - 13.8 -5.36 =73.8 - 13.8 - ( 1.64

26、+5.36 ), =60-7,=53;(52) 6.75 - (0.9+3.75 )=6.75 - 3.75 - 0.9 ,=3- 0.9 ,=2.1 ;(53) 27.38 - 5.34+2.62 -4.66 =22.04+2.62 - 4.66 , =24.66 - 4.66 ,=20;(54) 35.72 -4.9 - (5.72+5.1 ) =35.72 - (4.9+5.72+5.1 ), =35.72 - 15.72 ,=20;(55) 0.73 -0.25 - 0.73+0.25 =0.75 - 0.75 - 0.25+0.25 , =0- 0.25+0.25 ,=0- 0,=0

27、；(56) 5.3+0.1+5.3 - 0.1=5.3+5.3+0.1 -0.1,=10.6+0.1 -0.1 ,=10.7 - 0.1 ,=10.6;(57) 12.7 -4.8 -5.2 .=12.7 - (4.8+5.2);=12.7 - 10, =2.7 .(58) 23.25 - 6.75 - 3.25=23.25 - ( 6.75+3.25 ),=23.25 - 10, =13.25.(59) 4.58+2.39+ (5.42+7.61 )=(4.58+5.42 ) + (2.39+7.61 )= 10+10,=20;(60) 9.05 -3.86 -3.14 ,=9.05 - (

28、3.86+3.14 ),=9.05 - 7,=2.05;(61) 20- 9.18 - 0.82 ,=20- (9.18+0.82 ),=20- 10, =10.=15.45;(74) 9.4+0.3 -6.4,=(9.4 -6.4) +0.3,=3+0.3,=3.3 ;(75) 15.25+4.72+4.75+5.28 ,=(15.25+4.75 ) + (4.72+5.28 ),=20+10,=30;(76) 34.823 - (4.82+15.2 ),=34.823 - 4.82 - 15.2 ,=30.003 - 15.2 ,=14.803;(77) 12.7 -4.8 -5.2 ,=

29、12.7 - (4.8+5.2),=12.7 - 10,=2.7 ;(78) 3.1+25.78+6.9 ,=(3.1+6.9 ) +25.78,=10+25.78,=35.78 ;(79) 73.8 - 1.64 - 13.8 -5.36 ,=(73.8 - 13.8) - ( 1.64+5.36 ),=60-7,=53(80) 2.15+8.73+1.27+7.85=(2.15+7.85 ) + (8.73+1.27 ),= 10+10,=20;(81) 11.87 - (8.2+1.87 ),=11.87 - 1.87 -8.2 ,=10-8.2 ,=1.8 ;(82) 5.42 -3.

30、87 - 1.13 ,=5.42 - 5,=0.42 ;(83) 4.38 - 1.56+0.62 -0.44 ,=(4.38+0.62 ) - ( 1.56+0.44 ),=5- 2,=3；(84) 46.7 - 15.03 -4.97=46.7 - ( 15.03+4.97 ),=46.7 - 20,=26.7;(85) 4.52+0.61+1.39+6.48=(4.52+6.48 ) + (0.61+1.39 ),=11+2,=13;(86) 4.27 (1.96 1.73)(62) 6.53 - ( 1.53+2.6 ),=6.53 - 1.53 -2.6 ,=4-2.6 ,=1.4

31、.(63) 5.52 - 1.074 - 0.926 ,=5.52 - (1.074+0.926 ),=5.52 -2,=3.52 .(64) 4.21+1.04+0.79 ,=4.21+0.79+1.04 ,=5+1.04,=6.04(65) 1.36+4.85+2.64+6.15 ,=(1.36+2.64 ) + (4.85+6.15 ),=4+11,=15;(66) 83.7 - 12.83 -0.17 ,=83.7 - (12.83+0.17 ),=83.7 - 13,=70.7 ;(67) 4.32+5.43+6.68 ,=4.32+6.68+5.43 ,=11+5.43 ,=16.

32、43;(68) 17.17 -6.8 -3.2 ,=17.17 - (6.8+3.2 ),=17.17 - 10,=7.17 ;(69) 1+12.7+5.9+17.3=1+ (12.7+17.3 ) +5.9 ,=1+30+5.9,=36.9 ;(70) 270 - 42.5 - 17.5=270- (42.5+17.5 ),=270-60,=210;(71) 15.68 - (7.78 -4.32) - 2.32,=15.68 - 7.78+4.32 -2.32 ,= (15.68+4.32 ) - ( 7.78+2.32 ),=20- 10,=10;(72) 0.9+9.9+99.9+9

33、99.9 ,=1 - 0.1+10 - 0.1+100 - 0.1+1000 - 0.1 ,= (1+10+100+100。 ( 0.1+0.1+0.1+0.1 ),=1111-0.4 ,=1110.6(73) 25.46 -8.23 - 1.76 ,=25.46 - (8.23+1.76 ),=25.46 9.99=4.27 - 0.23 ,=4.04 ;(87) 7.27 - ( 1.98+0.27 ),=7.27 -0.27 - 1.98 ,=7-1.98 ,=5.02 ;(88) 13.7+8.65 - 9.628, =22.35 - 9.628 ,=12.722;(89) 12.8

34、- (4.38+1.614 ) =12.8 - 5.994=6.806(90) 15.17 - (3.6+4.9 ),=15.17 - 8.5 ,=6.67 ;(91) 35.6+ (12.6 -4.4),=35.6+8.2 ,=43.8 ;(92) 16.4+3.5+83.6+166.5=(16.4+83.6 ) + (3.5+166.5 ) =100+170=270;(93) 4.65 -2.55 - 1.45,=4.65 - (2.55+1.45 ),=4.65 -4,=0.65 ;(94) 1.28+0.86+38.72 ,=(1.28+38.72 ) +0.86 ,=40+0.86,

35、=40.86 ;(95) 25.74 -3.57 -6.43 ,=25.74 - ( 3.57+6.43 ),=25.74 - 10,=15.74;(96) 14.5 -4.68 -5.32 ,=14.5 - (4.68+5.32 ),=14.5 - 10,=4.5 ;(97) 0.485+0.64+3.36 , =0.485+ (0.64+3.36 ), =0.485+4,=4.485 ;(98) 72.51 -9.34 - 12.66 ,=72.51 - (9.34+12.66 ),=72.51 - 22,=50.51 ;(99) 14.02 -4.5+0.98 , =(14.02+0.9

36、8 ) - 4.5 , =15 4.5 ,=10.5;(100) 5.76+2.43+0.24+10.57 ,=(5.76+0.24 ) + (2.43+10.57 ),=6+13,=19;(101) 9.28 - (3.28+2.55 ),=9.28 - 3.28 - 2.55 ,=6- 2.55 ,=3.45;(102) 9.5+4.85 -6.13 , =14.35-6.13 ,=8.22 ;(103) 10.75 - 1.86 -2.75 -3.16 , =(10.75 - 2.75) - ( 1.86+3.16 ), =8- 5.02 ,=2.98(104) 1.3+0.94+0.0

37、6+7.7 ,=(1.3+7.7 ) + (0.94+0.06 ),=9+1,=10;(105) 4.45+0.63+5.55 ,=(4.45+5.55 ) +0.63 ,=10+0.63,=10.63;(106) 45.5 - (0.98+5.5 ),=45.5 - 0.98 - 5.5 ,=(45.5 -5.5) - 0.98 ,=40 - 0.98 ,=40- ( 1- 0.02),=40 - 1+0.2 ,=39.02 ;(107) 0.96 0.28+0.04 0.72 ,=(0.96+0.04 ) 0 ( 0.28+0.72 ), =11,=0.(108) 12.7+12.5+0.

38、5 ,=12.7+ (12.5+0.5 ),=12.7+13,=25.7(109) 0.6+0.94 - 0.208 ,=1.54 - 0.208 ,=1.332;(110) 27.73 - (4.73 - 1.85),=27.73 -4.73+1.85 ,=23+1.85,=24.85 ;(111) 3.84+26.5 - (20- 8.6), =3.84+26.5 -11.4, =3.84+15.1 ,=18.94(112) 7.38 -5.14+3.62 -2.86 , =(7.38+3.62 ) 5( 5.14+2.86 ), =11-8, 二3;(113) 5.86+13.08 -

39、9.27 ,=18.94 - 9.27 ,=9.67 ;(114) 25.4 - (15.4 -6.4),=25.4 - 15.4+6.4 ,=10+6.4,=16.4 ;(115) 47.23 - 7.23 5.89,=40 - 5.89 , =34.11 .(116) 4.45+0.63+5.55 , =4.45+5.55+0.63 , =10+0.63,=10.63;(117) 5.28 (2.9+1.28 ), =5.28 - 1.28 -2.9 , =4-2.9 , =1.1 ;(118) 5.25+7.86 - 2.86+4.75 , =(5.25+4.75 ) + (7.86 -

40、 2.86), =10+5, =15;(119) 0.96 - 0.28+0.04 -0.72 , =(0.96+0.04 ) - ( 0.28+0.72 ), =1 - 1, =0.(120) 9.42+7.39+1.58 ,=(9.42+1.58 ) +7.39,=11+7.39,=18.39;(121) 18.4 -1.6 -5.4 ,=18.4 - (1.6+5.4 ),=18.4 -7,=11.4(122) 75.7+39.4 - 23.86 , =115.1 - 23.86 , =91.24;(123) 21.21+38.38 - 9.79, =59.59 - 9.79 ,=49.

41、8 ;(124) 47.28+1.39+52.72 , =47.28+52.72+1.39 , =100+1.39,=101.39;(125) 2.45 - 1.68+1.54 ,=0.77+1.54 ,=2.31(126) 15-8.13 - 1.87 ,=15- (8.13+1.87 ),=15- 10,=5；(127) 5.14+3.225 - 6.302 ,=8.365 - 6.302 ,=2.063;(128) 3.95+5.36 - 1.95 ,=3.95 - 1.95+5.36 ,=2+5.36,=7.36;(129) 13.67 - (5.45+3.67 ),=13.67 -5

42、.45 - 3.67 ,=13.67 -3.67 -5.45 ,=10-5.45 ,=4.55;(130) 4.26+5.48 - 1.26+4.52 ,=(4.52+5.48 ) + (4.26 - 1.26),=10+3;=13;(131) 14.67+25.91+15.33+4.09 ,=(14.67+15.33 ) + (25.91+4.09 ),=30+30,=60(132) 10.75 - (2.4 -0.86),=10.75 - 1.54,=9.21 ;(133) 9.61 - 4.38+0.35 ,=5.23+0.35 ,=5.58 ;(134) 3.87+4.92+1.13

43、,=(3.87+1.13 ) +4.92 ,=5+4.92 ,=9.92 ;(135) 46.24 -8.66 - 1.34 ,=46.24 - (8.66+1.34 ),=46.24 - 10,=36.24 ;(136) 21.9 - 9.22 - 0.78+8.1 ,=21.9 - ( 9.22+0.78 ) +8.1 ,=21.9 - 10+8.1 ,=11.9+8.1 ,=20;(137) 35.47+39.88 - 12.37 ,=(35.47 - 12.37) +39.88,=23.1+39.88 ,(150) 1.3+2.83+8.7+0.17 , =(1.3+8.7 ) + (

44、2.83+0.17 ), =10+3,=13;(151) 2.47 - 2.2 - 3.8+7.53 , =(2.47+7.53 ) - ( 2.2+2.8 ), =10-5, =5(152) 6.89+4.7+2.11+5.3 ,=(6.89+2.11 ) + (4.7+5.3 ),=9+10,=19;(153) 7.46 2.37 - 1.63,=7.46 - (2.37+1.63 ),=7.46 - 4,=3.46;(154) 14- (3.65+0.24 ), =14-3.89 ,=10.11 ;(155) 70.8 - 1.25 - 1.75 ,=70.8 - ( 1.25+1.75

45、 ),=70.8 - 3,=67.8 ;(156) 5.81+8.3+4.19+11.7 , =(5.81+4.19 ) + (8.3+11.7 ), =10+20,=30;(157) 4.2+7.64+5.8+2.36 ,=(4.2+5.8 ) + (7.64+2.36 ),= 10+10,=20;(158) 14.28 -2.63 -7.37,=14.28 - (2.63+7.37 ),=14.28 - 10,=4.28 ;(159) 6.8+5.26+3.74+3.2 ,=(6.8+3.2 ) + (5.26+3.74 ),=10+9,=19;(160) 6.21 - 3.8+2.2 ,

46、=2.41+2.2 ,=4.61 ;(161) 6.03+3.7+2.97 ,=(6.03+2.97 ) +3.7 ,=9+3.7,=12.7;(162) 17.43 -6.57 -2.43,=17.43 - (6.57+2.43 ),=62.98 ;(138) 93.21 - 5.99 - 14.01 ,=93.21 - (5.99+14.01 ),=93.21 - 20,=73.21 ;(139) 15.37+28.94+4.63+1.06 ,=(15.37+4.63 ) + (28.94+1.06 ),=20+30,=50;(140) 42.37 - ( 12.37 - 9.78),=4

47、2.37 - 12.37+9.78 ,=30+9.78,=39.78(141) 38.78 - 19.59+41.22 - 30.41 , =38.78+41.22 - 19.59 - 30.41 , = (38.78+41.22 ) - ( 19.59+30.41 ), =80- 50,=30;(142) 1.9+19.9+199.9+0.3 =1.9+19.9+199.9+0.1+0.1+0.1 , =(1.9+0.1 ) + (19.9+0.1 ) + (199.9+0.1 ), =2+20+200,=222;(143) 429+31.1+2.04 ,=429+ (31.1+2.04 )

48、,=429+33.14,=462.14,(144) 100-27.2 -42.8 ,=100- (27.2+42.8 ),=100-70,=30,(145) 9- (3.02+1.25 ),=9-4.27 ,=4.73 ,(146) 1.8 - 1.57+0.2 ,=1.8+0.2 - 1.57 ,=2-1.57 ,=0.43(147) 5.03 - 2.5+0.96 ,=2.53+0.96 ,=3.49 ;(148) 35.72 - ( 5.9+5.72 ),=35.72 - 5.9 - 5.72 ,=35.72 - 5.72 - 5.9 ,=30- 5.9 ,=24.1 ;(149) 25

49、-4.7+5.3 ,=20.3+5.3 ,=25.6 ;=17.43 - 9,=8.43 ;(163) 20.47 - ( 1.47+6.8 ), =20.47 - 1.47 - 6.8 , =19- 6.8 ,=12.2 ;(164) 13.26+4.71+3.47+5.29 , =(13.26+3.47 ) + (4.71+5.29 ), =16.73+10, =26.73 ;(165) 22.74+8.68 - 13.74, =(22.74 - 13.74) +8.68, =9+8.68, =17.68(166) 12.56 - 6.64 - 3.36,=12.56 - (6.64+3.36 ),=12.56 - 10,=2.56 ;(167) 45.5 (0.98+5.5 ),=45.5 - 0.98 - 5.5 ,=45.5 - 5.5 - 0.98 ,=40 - 0.98 ,=39.02 ;(168) 13.6+7.94+6.4 ,=(13.6+6.4 ) +7.94,=20+7.94,=27.94 ;(169) 15.19+3.36+4.64+4.81 ,=(15.19+4.81 ) + (3.36+4.64 ), =20+8, =28(170) 4.7+7.69+5.3+2.31 ,=(4.7+5.3 ) + (7.69+2.31 ),= 10+10,