5xy²-[3xy²-(4xy²-2x²y)]+2x²y-xy

-3(xy-2x²)-[y²-(5xy-4x²)+2xy] 计算：(xy-x²)×x-y/xy 3x²y+xy²-[2xy²-4x²y+（x²y-2xy²） (2x²y-3xy²)-3(x²y-2xy²)+2（x²y-4xy&# x-y/x²÷x²-2xy+y²/xy*（xy-x²） 已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值 计算：x²+2xy+y²/xy-y².x²-2xy+y²/xy+y&# 计算 2xy[4x²y²-3y（xy+x²y）-xy²] 化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y² 已知x:y=3:2,求(x²+3xy)/(xy+2xy) X²+2xy+y²/xy乘x²-2xy+y²/xy+y²= 合并同类项：(2xy²+3xy²)-(6x²y-3xy²)