0.125x*3+8y*3

【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 5(x-y)^2-(x-y)-8(x-y)^2-3(x-y) (3x-4y)(5x-4y)-(7x-8y)(6y-5x) 1.（（y+2x)(-2x+y)+4(x+2y)^2)/3y 2.（2(x-y)^3-8(x-y）^2(x+y)+6y( 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 【x-y-(x-y分之4y平方)】【x+y-(x+y分之4x平方)】除以【3(x+y)-x-y分之8xy】 2(x-y)+3（x+y）2-5(x-y)-8（x+y）2-（x-y） 计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8 已知：3x=8y.求（1）x+y/y (2)2x+3y/x-2y (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai 9y=3x-(x-1),4(x+y)-(2x+4)=8y