计算 (5y/6x^3)^2·{-(3x^4/5y^2)}^3

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2/3x-2/x+y(x+y/3x-x-y)/x-y/x 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)^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+y)(x+y)^2(-x-y)^3 3x(x-y)+2y(x-y) 计算 计算 (5y/6x^3)^2·{-(3x^4/5y^2)}^3 计算 (5y/6x^3)^2·{-(3x^4/5y^2)}^3 计算-(x-5y)-(-3x+2y) 计算：（3x-4y）-[-（2y+x）+（x-3y）]-6x