五年级奥数小数的巧算练习题

------------------------------------------------------------------------五年级奥数小数的巧算练习题五年级奥数小数的巧算练习题

1．1.135+3.346+5.557+7.768+9.979=_____.2.1.996+19.97+199.8=_____.3.6.11+9.22+8.33+7.44+5.55+4.56+3.67+2.78+1.89=_____.4.1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19=_____5.2.89×4.68+4.68×6.11+4.68=_____.6.17.48×37-17.48×19+17.48×82=_____.7.1.25×0.32×2.5=_____.8.75×4.7+15.9×25=_____.9.

28.67×67+32×286.7+573.4×0.05=_____.10.

172.4×6.2+2724×0.381028个0963个011.

0.00．．．01811028个0963个012.

12.34+23.45+34.56+45.67+56.78+67.89+78.91+89.12+91.231994个01996个013.

a=0.00．．．0105b=0.00．．．019计算a+ba-ba×ba÷b1994个01996个0

a+ba-ba×ba÷b14.

4.75-9.64+8.25-1.3615.

3.71-2.74+4.7+5.29-0.26+6.316.

(5.25+0.125+5.75)×817.

34.5×8.23-34.5+2.77×34.518.

6.25×0.16+264×0.0625+5.2×6.25+0.625×2019.

0.035×935+0.035+3×0.035+0.07×61×0.520.

19.98×37-199.8×1.9+1998×0.8221.

13.5×9.9+6.5+5.75×10.122.

0.125×0.25×0.5×6423.

11.8×43-860×0.0924.

32.14+64.28×0.5378×0.25+0.5378×64.28×0.75-8×64.28×0.125×0.537825.

0.888×125×73+999×325.

1998+199.8+19.98+1.9981996个02000个026.

a=0.00．．．0125b=0.00．．．08计算a+ba-ba×ba1996个02000个0五年级奥数小数的巧算练习题答案

1.

27.785

2.

221.766

原式=(2-0.004)+(20-0.03)+(200-0.2)

=222-(0.004+0.03+0.2)

=221.766

3.

111109

提示:仿上题.

4.

49.55

5.

103.25

原式=1.1×(1+3+…+9)+1.01×(11+13+…+19)

=1.1×25+1.01×75

=103.25

6.

46.8

7.

1748

原式=17.48×37-17.48×19+17.48×82

=17.48×(37-19+82)

=17.48×100

=1748

8.

1

原式=(1.25×0.8)×(0.4×2.5)

=1×1

=19.

750

原式=75×4.7+5.3×(3×25)

=75×(4.7+5.3)

=75×10=750

10.

2867

原式=28.