x^7-x^5y^2 x^2y^5-b^7等于多少快
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x^7-x^5y^2x^2y^5-b^7等于多少快x^7-x^5y^2x^2y^5-b^7等于多少快x^7-x^5y^2x^2y^5-b^7等于多少快x^7-x^5y^2=x^5(x^2-y^2)=x
x^7-x^5y^2 x^2y^5-b^7等于多少快
x^7-x^5y^2 x^2y^5-b^7等于多少
快
x^7-x^5y^2 x^2y^5-b^7等于多少快
x^7-x^5y^2
=x^5(x^2-y^2)
=x^5(x+y)(x-y)
x^2y^5-y^7
=y^5(x^2-y^2)
=y^5(x+y)(x-y)
1、(-y^3)^5/y^3/ y^2+2(-y)^102、(x-y)^7/(y-x)^6+(x+y)^3/(x+y)^23、已知X^a=5,x^b=3,求X^(3a-2b)的值
因式分解：（1）、(2a-3b)(7x+y)+(x-5y)(3b-2a)（2）、（x+y）^3(x+y)^2-(-x-y)
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y)
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
因式分解:10a(x-y)^2-5b(y-x)
5x(x-y)+2y(x-y)
化简:5(x-y)+2(x+y)-3(x-y)
(2x-7)(x-1)+(2x-3)(2x+3) 2(x-8)(x-5)-(2x-1)(x+2) 3x(3y-x)-(4x-3y)(x+3y)(2-b)(3+b)-(2-b)(2+b)1.(2x-7)(x-1)+(2x-3)(2x+3) 2.2(x-8)(x-5)-(2x-1)(x+2) 3.3x(3y-x)-(4x-3y)(x+3y)
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
x^7-x^5y^2 x^2y^5-b^7等于多少快
（X+2Y)(5X-2Y)
(x+2y)(5x-2y)
4x+2y-5x-y
(2x-3y)-(5x-y)
(2X-3y)-(5x-y)
(x-y)^2+5(x-y)-14