计算(-1/2x^2y)^-3乘(1/3xy^-2)^2
计算3xy[2xy-x(y-2)+x-1]
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:3xy[2xy-x(y-2)+x]
化简:2乘根号xy^3/(-1/2乘根号x^3y^2)
计算:(2分之1x^(2)y-2xy+y^(2))·3xy
多项式乘多项式(x-3)(y+2)=xy (x+1)(y-1)=xy-6
计算:(-3x^2y)(1/3xy^2)=?
计算:(-3x^y)(1/3xy^2)=?
计算:(1).(-2xy²)*(3x²y)²
已知x^2乘y^5〈0, 化简-3xy丨-1/3(-x)^3乘(-y)^7丨