计算(2X)^2(-XY)^3-(-3XY)(-2X^2Y)^2
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
(x^2+xy/x-y)/(xy/x-y)计算
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算3y/(2x+2y)+2xy/x^2+xy
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
计算:2x+2y分之3y + x²+xy分之2xy
计算:3y/(2x+2y) +2xy/x²+xy
计算:(-7x²y)(2x²y-3xy³+xy)
计算(xy-y^2)÷x-y/xy