0.5x²+xy+0.5y²

计算：(xy-x²)×x-y/xy 化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1, x²/xy-x/y [-xy/(x-y)²]²×(y²-xy/x)³ x/xy-y²与y/x²-xy 通分 x-y/x²÷x²-2xy+y²/xy*（xy-x²） 已知x+y=1,求0.5x²+xy+0.5y²的值 x+y=1,则0.5x²+xy+0.5y²= ? 如果x+y=1,那么0.5x²+xy+0.5y²的值是多少 计算：x²+2xy+y²/xy-y².x²-2xy+y²/xy+y&# 计算：（xy-x²）乘 x-y分之xy 2/5x²y·（-0.5xy）²-（-2x）³·xy³