化简:1/2x²+xy-1.5y²/x²-y²
x²/xy-x/y
化简:[(x+y)²-(x-y)²]÷2xy
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
计算:(xy-x²)×x-y/xy
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
【(1)/(x-y)+(1)/(x-y)】÷(2x)/(x²-2xy+y²)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
化简2XY+(X-Y)²
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:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)