(-1/2x^3-3/2xy+1/4y^2)(-2xy^2)^2计算

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 先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1 计算(3x^3y-x^2y+1/2xy)÷(-1/2xy） 计算:(2分之1x^(2)y-2xy+y^(2))·3xy 计算 2xy[4x²y²-3y（xy+x²y）-xy²] xy(xy+1)+(xy+3)-2(x+y+2分之一）-(x+y-1)的平方 (-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)] 5x^2y/-1/2xy*3xy^2 y^3+xy^2+2xy+x^2-1 因式分解 （x^2+xy/x-y)/（xy/x-y)计算