计算(-1/2x^2 *y^3)* 2^4* x^5* y^5

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^2y^-3（x^-1y）^3 计算(x+y)(x+y)^2(-x-y)^3 3x(x-y)+2y(x-y) 计算 (2x+y)(x+3y-1)计算 计算(x+y-1)^2 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 计算：x+2y/x-y+2x/y-x-3y/x-y 计算3x[xy-2x(1/y-x/3]+3y(x²-y²) 计算:y×(y/x)^3÷[-(x^2)/y]^-2 计算：y(x-y)^2+(y-x)^3=? 1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y) 计算:2/x+1/(x-y) 计算2x/x-y 计算：x(x-3y)(5x-2y)