初一整式加减计算题三十道附加答案

2025-03-17 02:16:24
推荐回答(1个)
回答1:

1.3ab-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)=______.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.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______.还有一些题一、1、a+(2b-3c-4d)=_________;2、a-(-2b-3c+4d)=________;3、(m-n)-3(z-p)=________;4、3x-[5x-(2x-1)]=________;5、4x2-[6x-(5x-8)-x2]=___________;二、化简(28分)1、(1)(3x+5y)+(5x-7y)-2(2x-4y);(2)5ab-{1、a+(2b-3c-4d)=2、a-(-2b-3c+4d)=3、(m-n)-3(z-p)=4、3x-[5x-(2x-1)]=5、4x2-[6x-(5x-8)-x2]=6、(3x+5y)+(5x-7y)-2(2x-4y);7、5ab+[2a2b+(a2b-3ab)]-2a2b}三、化简后求值(16分)(2x2-x-1)-(x2-x-)+3(x2-1),其中x=1.四、1、7x-3y-4z=-(_________);2、a2-2ab-a-b=a2-2ab-(_________);3、5x3-4x2+2x-3=5x3-(_________)-3;4、a3-a2b+ab2=-(_______)+ab2=a3-(________);5、5a2-6a+9b=5a2-3(_____)=-6a-(______);6、x3-3x2y+3xy2-y3=x3-3x2y-(_____)=x3-y3-(______);五、(1)(x3-4x2y+5xy2-3y3)-(-2xy2-4x3+x2y);(2)一个多项式减去3a4-a3+2a-1得5a4+3a2-7a+2,求这个多项式.六、先化简下列各式,再求值(45分)(1)x-2(x-)+3(x+),其中x=-4;(2)(3xy-2x2)-(2x2-y2)-(y2-2xy)+(-y2+5x2+xy),其中x=,y=-;(3)5xyz-{2x2y-[3xyz-(4xy2-x2y)]}其中x=-2,y=-1,z=3;7.已知M减去N等于3,M的平方减去N的平方等于8,求MN的值

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