完整版整式的加减50题有答案

1、整式的加减50题有答案(1) 7-3x-4x 2+4x-8x2-15(2) 2(2a 2-9b)-3( 4a2+b)(3) 8x 2-3x-(2x 2-7x-5)+3+4xa,15.6(2a 胃) 3(5) 2 a -(5b - a) b1(6)-3(2x -y) - 2(4x -y) 2021(7)- 2m -3(m - n 1) - 2 1 -1222222(8)3(x -y ) (y -z ) -4(z -y )2_2_ 22_(9)x -x - x -(x -1)-1-1-1(10) (2x-3y)+(5x+4y)(11) (8a-7b)-(4a-5b)(12) a-(2a+b)+2(

2、a-2b)(13) 3(5x+4)-(3x-5)(14) x+ x+(-2x-4y)(15) (a+4b)- (3a-6b)(16)3x2-1-2x-5+3x-x(17) (a+4b)- (3a-6b)(18)4x+2y 5xy(19) 3ab+7 2a29ab 3(20) 7x2-2x+3x-7x 2(21) -0.8a 2b-6ab-1.2a 2b+5ab+b(22) 2a2 -lab -a2 ab-b2 324(23) 6x2y+2xy-3x 2y2-7x-5yx-4y 2x2-6x 2y(24) 8x + 2y+2 (5x 2y)(25) 3a- (4b-2a+1)(26) 7m+ 3

3、 (m+ 2n)(27) (x2 y2) -4 (2x2 3y2)1(28) -4x+3 (x 2) 3(29) 5(2x-7y)-3 (4x-3y)o. 1 o.(30) 2a2ba2b21 .1 .1 9.(31) 2ab 3a b - - a b 2(32) a3 - a2b -ab2 a2b-ab2 b3(33) 3x2y-4xy2-3 5x2y 2xy2 5(34) 2a2b -3a2b 1a2b 2(35) a3 -a2b ab2 a2b-ab2 b3(36) 3x2 4x -2x2 -x x2 -3x -1(37) 3x -5x -4(2x -1)(38) (3x-5y)-(6x

4、+7y)+(9x-2y)_2(39)-1-7x+3x-7x(40) 3(a2 -2ab) -2(-3ab b2)(41) -3(2x3y-3x2y2+3xy3)(42) 2x2 3x + 4x2 (3x2 x)D(43) 4x2y-8xy 2+7-4x2y+12xy2-4(44)a 2-2ab+b2+2a2+2ab - b 2 ,35. 一(45)先化间,再求值：一 m -(一 m -1) +3(4 - m),其中 m = -3.22(46 )化简：7a2b +(4a2b +5ab2) (2a2b -3ab2).1(47) 2x2 -x2 -2(x2 -3x-1)-3(x2 -1-2x) 其中

5、：x=2(48) 2(ab2 2a2b)3(ab2 -a2b) + (2ab2 -2a2b) 其中：a = 2,b=1(49)：A=4x24xy + y2 , B=x2 +xy -5y2,求(3A-2B) (2A+B)的 值.(50)假设|a2+(b+3f =0,求 3a2b 2ab2 2 (ab 1.5a2b) +ab+3ab2的值;(1) 7-3x-4x 2+4x-8x2-15 = -12x 2+x-8(2) 2(2a 2-9b)-3( 4a2+b) = 16a 2-21b(3) 8x 2-3x-(2x 2-7x-5)+3+4x=10x 2-8一、a 1、(4)5-6(2a +)=3-14

6、a 3(5) 2a -(5b - a) b = 3a-4b1、八(6) (6) - 3(2x - y) - 2(4x -y) 2021 = 14x+2y+2021一2m-3(m-n1)-2l-1= m-3 n+4 222222222(8)3(x - y ) (y -z ) -4(z - y ) = 2y +3x-5z2_2_ 22(9)x -x -x -(x -1) -1 -1 -1=0(10) (2x-3y)+(5x+4y)=7x+y(11) (8a-7b)-(4a-5b)=4a-2b(12) a-(2a+b)+2(a-2b)=a-5b(13) 3(5x+4)-(3x-5)=12x-17(1

7、6) x+ x+(-2x-4y) =-4y(17) (a+4b)- (3a-6b)=-2a+10b(17)3x2-1-2x-5+3x-x 2 =2x 2+x -6(17) (a+4b)- (3a-6b)=-2a+10b(18)4x+2y 5xy =-x+y(20) 3ab+7 2a 9ab 3=2a 12ab+4(20) 7x2-2x+3x-7x 2 = x(22) -0.8a 2b-6ab-1.2a 2b+5ab+4b=-a2b-ab2 O 13 OO/r22) 2a2,ab -a2 ab-b2 =17 a2+0.5ab-b 232412(23) 6x2y+2xy-3x 2y2-7x-5yx

8、-4y 2x2-6x 2y=-7x 2y2 -3xy-7x(24) 8x + 2y+2 (5x 2y) =18x-2y(25) 3a- (4b-2a+1) =5a-4b-1(26) 7m+ 3 (m+ 2n) =10m+6n(27) (x2 y2) -4 (2x2 3y2) =-7x2+11y21(28) -4x+3 (1x-2) =-3x-63(29) 5(2x-7y)-3 (4x-3y)=-2x-26y212.(30) 2a2ba2b= 2,5a 2b22212.(36) 2a b 3a b a b=4,5 a 2b2/一、32222, 3(37) a a b -ab a b - ab b

9、 =a3+2a2b-2ab2+b32222-(38) 3x y -4xy -3 5x y 2xy 5 = 8x 2y-2xy 2+2o.o. 1 o.(39) 2a2b -3a2ba2b=-0,5a 2b2(40) a3 -a2b ab2 a2b -ab2b3= a3+b3(41) 3x2 4x - 2x2- x x2 - 3x-1=2x2-1(42) 3x-5x -4(2x-1) = 6x-4(43) (3x-5y)-(6x+7y)+(9x-2y)=6x-14y(39)-1-7x+3x-7x 2 = -7x 2-4x-1(40) 3(a2 -2ab) -2(-3ab b2)=3a2-2b2(

10、41) - 3(2x 3y 3x2y2+ 3xy3) =_ 6x3y+9x2y2-9xy3)(43) 2x2 -'：-3x + 14x2 -(3x2 -x) :'=x2+2x(44) 4x2y-8xy 2+7-4x2y+12xy2-4= 4 xy 2 +3(44)a 2-2ab+b2+2a2+2ab - b 2=3a235(45)先化间,再求值：一 m -(- m -1) +3(4 - m),其中 m = -3. 22一 3535斛： m -(一 m -1) 3(4 -m)= m - - m 1 12 -3m( )= -4m 13 2222当 m = 4 时,4m + 13 = 4x(3)+13 = 25(46)化简：7a2b +(4a2b +5ab2) -(2a2b -3ab2).解：7a2b (-4a2b 5ab2) -(2a2b-3ab2)= 7a2b - 4a2b 5ab2 - 2a2b 3ab2_ 2_22_ 2=(7 -4 -2)a b (5 3)ab ()= a b 8ab1(47) 2x2 -x2 -2(x2 -3x-1)-3(x2 -1-2x)其中：x=2219=6x 12 x 5 =2(49) 2(ab2 2a2b)3(ab2 -a2b) + (2ab2 -2a2b) 其中：a = 2,b=