计算﹙x+y﹚²﹙x-y﹚²+﹙2x-y﹚²﹙2x+y﹚²
计算 x+2y+﹙4y²/x-2y﹚+﹙4x²y/4y²-x²)
[(x+2y)²-﹙x-y﹚﹙x+2y﹚-5y²]÷﹙2y﹚²等于多少
(x+3y)/﹙x²-y²﹚-(x+2y)/(x²-y²)+﹙2x-3y﹚/﹙x
﹙x+y﹚﹙x-y﹚-﹙x-y﹚²
计算[x/﹙xy+y﹚]·[﹙x²+x﹚/x²y]
因式分解:﹙x+y﹚²+﹙x+y﹚-20=
解方程组{x²+2xy+y²=25,﹙x-y﹚²-3x+3y+2=0}
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
计算,题目在下,快﹙1﹚(2x²y+3x²y)-(6x²y-3x²﹚ ﹙2﹚﹙5
已知2x-y/x+3y=2,求代数式﹙4x-2y/x+3y﹚-﹙4x+12y/2x-y﹚的值
解方程组﹛﹙x+2﹚²-﹙y-3﹚²=﹙x+y﹚﹙x-y﹚ x-3y=2
计算.x²-y²分之x×-x²分之﹙x-y﹚².x+1分之x-1×1-x分之1+