(2x-y)(4x²+2xy+y²)化简
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.
化简:(x²+y²/x-y)-(2xy/x-y)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²
化简:[(x+y)²-(x-y)²]÷2xy
(-x-2y)(x²-2xy+4y²)
化简(X²+2XY+Y²)(X²—XY+Y²)²
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
化简(3X²-XY+Y²)-5(X²-XY+2Y²)