计算 x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算:(xy-x²)×x-y/xy
计算x²y³-2x(4xy³)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
化简:[(x+y)²-(x-y)²]÷2xy
(-x-2y)(x²-2xy+4y²)
1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.
x²+y²+2xy分之x²-4y² ÷x²+xy分之2y+x