化简x²-2xy 除xy-2y²
化简求值(x+y)(x-y)-(x-y)²-6x²y除2y+(2xy)²除(-4xy)其中
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
化简2XY+(X-Y)²
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=
因式分解xy²-2xy+x+2y-1
化简(X²+2XY+Y²)(X²—XY+Y²)²
化简-3x²y+2x²y+3xy²-2xy²
化简(3X²-XY+Y²)-5(X²-XY+2Y²)
化简:[(x+y)²-(x-y)²]÷2xy
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]