计算(8x-7y)(7y+8x)-(7x+8y)(7x-8y)

（x-y)^2+7(x+y)-11(x-y)^2-8(X+Y)的计算过程 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) 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) 计算(8x-7y)(7y+8x)-(7x+8y)(7x-8y) 3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算 (7x+y)(7x-y)-(-x+y)(x-y) 用乘法公式计算 怎么算? 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2 计算：(x-y)^8÷(y-x)^4×(x-y) 计算：[(-3x^2*y^4)^2*x^3-2x(3x^2*y^2)^3*1/2y^2]/9x^7y^8 计算3x/(x-3y)+(x+y)/(4y-x)-7y/(x-4y)=? (3x-4y)(5x-4y)-(7x-8y)(6y-5x) (x-y)^2+7(x+y)-11(x-y)^2-8(x+y),先化简.再求值 (x-y)的平方+7（x+y)-11（x-y)的平方-8（x+y) 3(x-y)^2-7(x-y)+8(y-x)^2+6(y-x)合并同类项. 18(x+y)^8(x-y)^7÷[3(x+y)^3(x-y)^3]^2 因式分解:8(x-2y)-x(7x+y)+xy. (7x^2y^3-8x^3y^2z)/8x^2y^2计算