化简x-y/2xy-x²-y²
化简:[(x+y)²-(x-y)²]÷2xy
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
化简2XY+(X-Y)²
x²/xy-x/y
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.
化简x-y分之x + x³-2x²y+xy²分之y³ ÷ y²-x
计算:(xy-x²)×x-y/xy
化简:(x²+y²/x-y)-(2xy/x-y)
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
因式分解2x-2y-x²+y² 化简x²-y²/x²y+xy²
化简(X²+2XY+Y²)(X²—XY+Y²)²