化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
化简(3X²-XY+Y²)-5(X²-XY+2Y²)
化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
化简(X²+2XY+Y²)(X²—XY+Y²)²
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y