150道化简求值题.docx

1、150道化简求值题 150道化简求值题13ab-4ab+8ab-7ab+ab=_. 2.7x-(5x-5y)-y=_. 3.23a3bc2-15ab2c+8abc-24a3bc2-8abc=_. 4.-7x2+6x+13x2-4x-5x2=_. 5.2y+(-2y+5)-(3y+2)=_. 6.(2x2-3xy+4y2)+(x2+2xy-3y2)=_. 7.2a-(3a-2b+2)+(3a-4b-1)=_. 8.-6x2-7x2+15x2-2x2=_. 9.2x-(x+3y)-(-x-y)-(x-y)=_. 10.2x+2y-3x-2(x-y)=_. 11.5-(1-x)-1-(x-1)=_.

2、 12.( )+(4xy+7x2-y2)=10x2-xy. 13.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3. 14.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=_. 15.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=_. 16.若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为_. 17.一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于_. 18.-(2x2-y2)-2y2-(x2+2xy)=_. 19.若-3a3b2与5ax-1by+2是同类项,则x=_,y=_. 20.(-

3、y+6+3y4-y3)-(2y2-3y3+y4-7)=_. 21.化简代数式4x2-7x2-5x-3(1-2x+x2)的结果是_. 22.2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ). 31.3a-(2a-3b)+3(a-2b)-b=_. 23.化简代数式x-y-2x-(x+y)等于_. 24.5a2+( )a-7+( )a2-4a+( )=a2+2a+1. 25.3x-y-(2x+y)=_. 26.化简|1-x+y|-|x-y|(其中x0)等于_. 27.已知xy,x+y-|x-y|=_. 28.已知x0,y0,化简|x+y|-|5-x-y|=_. 29.4a2n

4、-an-(3an-2a2n)=_. 30.若一个多项式加上-3x2y+2x2-3xy-4得 2x2y+3xy2-x2+2xy, 则这个多项式为_. 31.-5xm-xm-(-7xm)+(-3xm)=_. 32.当a=-1,b=-2时, a-(b-c)-b-(-c-a)=_. 33.当a=-1,b=1,c=-1时, -b-2(-5a)-(-3b+5c)=_. 34.-2(3x+z)-(-6x)+(-5y+3z)=_. 35.-5an-an+1-(-7an+1)+(-3an)=_. 36.3a-(2a-4b-6c)+3(-2c+2b)=_. 38.9a2+7a2-2a-(-a2+3a)=_. 39

5、. 当2y-x=5时,5(x-2y)2-3(-x+2y)-100=_. 40. 2(2a2+2ab)-(3a2+4ab-b2），其中a=2，b=-141 .1/4（a+b）2-6(a-b)+3/4(a+b)2+6(a-b)42 .5（a-b）2-3(a-b)2-7(a-b)-(a-b)2+7(a-b)43. 1/2a2-1/4b+3/2a2-3/4b-a244. -5yx2+4xy2-2xy+6x2y+2xy+545.16m+25-40m+34m46.(4+2x)+(2x-x)47.4a+8a-(-6a)+3a-2b48.8a+4(a+2)49.(2n-3)+(2n+3)-(2n-3)50.7

6、x-(5x-5y)-y51.3a-4b+4a-3b52.7a+3b-(4a+5b)-353.3ab-4ab+8ab-7ab+ab54.(x-y)-2(x-y) 55.16m+25-40m+34m56.(4+2x)+(2x-x)57.4a+8a-(-6a)+3a-2b58.8a+4(a+2)59.(2n-3)+(2n+3)-(2n-3)60.7x-(5x-5y)-y61.3a-4b+4a-3b62.7a+3b-(4a+5b)-363.3ab-4ab+8ab-7ab+ab64.(x-y)-2(x-y) 64.x-y-2x-(x+y)65.3ab-4ab+8ab-7ab+ab66.7x-(5x-5y

7、)-y67.23a3bc2-15ab2c+8abc-24a3bc2-8abc 68.-7x2+6x+13x2-4x-5x269.2y+(-2y+5)-(3y+2) 70.(2x2-3xy+4y2)+(x2+2xy-3y2) 71.2a-(3a-2b+2)+(3a-4b-1)72.-6x2-7x2+15x2-2x2 73.2x-(x+3y)-(-x-y)-(x-y)74.2x+2y-3x-2(x-y) 75.5-(1-x)-1-(x-1)76.10x2-xy 78.x3-2x2y+4xy2+y3 79.4x2-7x2-5x-3(1-2x+x2)80.2(2a+2ab)-(3a+4ab-b），其中

8、a=2，b=-181.1/4（a+b）-6(a-b)+3/4(a+b)+6(a-b)82.5（a-b）-3(a-b)-7(a-b)-(a-b)+7(a-b)83.1/2a-1/4b+3/2a-3/4b-a84.-5yx+4xy-2xy+6xy+2xy+585.16m+25-40m+34m86.(4+2x)+(2x-x)87.4a+8a-(-6a)+3a-2b88.8a+4(a+2)89.(2n-3)+(2n+3)-(2n-3)90.7x-(5x-5y)-y91.3a-4b+4a-3b92.7a+3b-(4a+5b)-393.3ab-4ab+8ab-7ab+ab94.(x-y)-2(x-y) 9

9、5.16m+25-40m+34m96.(4+2x)+(2x-x)97.4a+8a-(-6a)+3a-2b98.8a+4(a+2)99.(2n-3)+(2n+3)-(2n-3)100.7x-(5x-5y)-y101.3a-4b+4a-3b102.7a+3b-(4a+5b)-3103.3ab-4ab+8ab-7ab+ab104.(x-y)-2(x-y) 105.x-y-2x-(x+y)106.3ab-4ab+8ab-7ab+ab107.7x-(5x-5y)-y108.23a3bc2-15ab2c+8abc-24a3bc2-8abc 109.-7x2+6x+13x2-4x-5x2110.2y+(-2

10、y+5)-(3y+2) 111.(2x2-3xy+4y2)+(x2+2xy-3y2) 112.2a-(3a-2b+2)+(3a-4b-1)113.-6x2-7x2+15x2-2x2 114.2x-(x+3y)-(-x-y)-(x-y)115.2x+2y-3x-2(x-y) 116.5-(1-x)-1-(x-1)117.10x2-xy 118.x3-2x2y+4xy2+y3 119.4x2-7x2-5x-3(1-2x+x2)120.（3X+2Y)+(4X+3Y)其中X=5,Y+3121.(5a2-3b2)+(a2+b2)-(5a2+3b2),其中a=-1,b=1 122.-2(x- )+3( x

11、+ ),其中x=-4；123.(3xy-2x2)-(2x2-y2)-(y2-2xy)+(-y2+5x2+xy),其中x= ,y=- ；124.5xyz-2x2y-3xyz-(4xy2-x2y)其中x=-2,y=-1,z=3；125.3ab-4ab+8ab-7ab+ab=_. 126.7x-(5x-5y)-y=_. 127.23a3bc2-15ab2c+8abc-24a3bc2-8abc=_. 128.-7x2+6x+13x2-4x-5x2=_. 129.2y+(-2y+5)-(3y+2)=_. 130.(2x2-3xy+4y2)+(x2+2xy-3y2)=_. 131.2a-(3a-2b+2)

12、+(3a-4b-1)=_. 132.-6x2-7x2+15x2-2x2=_. 133.2x-(x+3y)-(-x-y)-(x-y)=_. 134.2x+2y-3x-2(x-y)=_. 135.5-(1-x)-1-(x-1)=_. 136.(4xy+7x2-y2)=10x2-xy. 137.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3. 138.若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为_. 139. -(2x2-y2)-2y2-(x2+2xy)=_. 140.2X6-2(X-2) 其中 X=-2141.(5a2a234a3)(a3a3a2)，其中a2

13、142.(2m2n2mn2)2(m2n1)2mn22，其中m2，n2143.(5a2a234a3)(a3a3a2)，其中a2144.(2m2n2mn2)2(m2n1)2mn22，其中m2，n2145.3(abbc)3(abac)4ac3bc 其中：a2001/2002，b1/3，c1146.（3xy10y）5x(2xy2y3x)其中xy2，xy3147.已知a2，b1，c3，求代数式5abc2a2b3abc（4ab2a2b）的值。148.2 ( a2b + ab2)- 2ab2 - (1- a2b) - 2，其中a= -2，b=05149.（3x24y）（2x2-5y+6）+(x2-5y-1) 其中 x=-3 ,y=-1150.3ab-4ab+8ab-7ab+ab其中a=1b=2