计算3xy[2xy-x(y-2)+x-1]

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