计算 ( x-2y )^4 ÷ ( 2y-x )^ 2 ÷ ( x-2y )

计算：[（x+y）³-2(x+y)²-4(x+y)]÷（x+y) 计算[(x+y)的立方-2(x+y)的平方-4(x+y)]÷(-x-y) 计算:y×(y/x)^3÷[-(x^2)/y]^-2 计算:2xy/(x+y)².(x+y)/4y 计算 ( x-2y )^4 ÷ ( 2y-x )^ 2 ÷ ( x-2y ) 计算:16(2x+y)^3÷(-4x-2y)^2·(2x-y) （4x^2y+x^3y^3）÷（-2x^2y）计算 计算[(x+y)平方-(x-y)平分-4x平分y平分]÷(2xy) 计算4（x+y）^5（x-y）^4÷[2（x+y）³*（y-x）²] 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 [(2x+y)(x-3y)+y(x+3y)]÷(2x)计算, 计算[(x+2y)²-(x+y)(x-y)-5y²]÷(2x) 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) 计算：(x+y/x-y)÷(xy+x^2) (x-3y)(y+2x)-(4y-3x)(3x+4y)计算 计算:(x-y)^2*(x+y)^3*(-x-y)^3*(y-x)^4 计算:y-x分之x+y+x-y分之y-y-x分之2x-y