计算 1.[-2(xy)^2]^3*(xy^2)^3*(-2x^2y)
计算:3xy[2xy-x(y-2)+x]
计算3xy[2xy-x(y-2)+x-1]
1.计算 (-x方+2xy-y方)-2(xy-3x方)+3(2y方-xy)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
计算:(-7x²y)(2x²y-3xy³+xy)
(x^2+xy/x-y)/(xy/x-y)计算
(2X平方y+3xy平方)-(6x平方-3XY平方)(计算)
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
计算(xy-y^2)÷x-y/xy
计算3y/(2x+2y)+2xy/x^2+xy