计算5x^3y*(-3y)^2+(-6xy)^2*(-xy)-xy^3(-4x)^2

计算：x(x-3y)(5x-2y) 计算:(x+3y)(2x-y) 计算:(2x-3y)(x+y) 计算:(-x-2y) * (3x-y) 计算：(x+y)-3(x-2y). 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2/3x-2/x+y(x+y/3x-x-y)/x-y/x 计算(x+y)(x+y)^2(-x-y)^3 3x(x-y)+2y(x-y) 计算 计算：x+2y/x-y+2x/y-x-3y/x-y 计算:(x+y)^2×(-x-y)^3×[-3/4(x-y)^3]×5/6(y-x)^2 计算:(x+y)^2×(-x-y)^3×[-3/4(x-y)^3]×5/6(y-x)^2 (计算方程组x+y)/2=6-(x-y)/3,6(x+y)-5(x-y)=18 2(x+y-z)-3(x-y+z)-5(x+y-z)+6(x-y+z) 计算 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-(x-5y)-(-3x+2y) 计算(x+y)(x-y)(x+y)3次方(x-y)5次方计算(x+y)×(x-y)×(x+y)3次方×(x-y)5次方