3x-3y-7x-5y
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
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)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
(y-x)(x-y)^3(y-x)^5怎么算
数学(x-y)^5*(y-x)^3*(x-y)^2
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(3x+y)(3x-7y)
(2X-3y)-(5x-y)
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
x-4y分之3x + 4y-x分之x+y - x*x-4y分之7y
[(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)
y-x=3 7x+5y=-9