计算(-3x^2y)×(1/3xy^2)
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算:(2分之1x^(2)y-2xy+y^(2))·3xy
计算:(-3x^2y)(1/3xy^2)=?
计算:(-3x^y)(1/3xy^2)=?
计算:(1).(-2xy²)*(3x²y)²
计算2分之1xy²(-2xy)+3x²y的3次方=
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算3y/(2x+2y)+2xy/x^2+xy