16﹙x+y﹚²-25﹙x-y﹚²
计算[x/﹙xy+y﹚]·[﹙x²+x﹚/x²y]
计算 x+2y+﹙4y²/x-2y﹚+﹙4x²y/4y²-x²)
49﹙x-y﹚²-25﹙x+y﹚²怎么因式分解?
[3﹙x-y﹚^4 ﹙x+y﹚^5 -6﹙x-y﹚^3 ﹙x+y﹚^4 ]÷[3﹙x-y﹚²﹙x+y﹚
﹙x+y﹚﹙x-y﹚-﹙x-y﹚²
[(x+2y)²-﹙x-y﹚﹙x+2y﹚-5y²]÷﹙2y﹚²等于多少
f(x+y,xy)=x²+y²,则f﹙x,y﹚=?函数z=2xy-3x²-3y²
[﹙x+2y﹚﹙x-2y﹚-﹙2x-y﹚²+﹙3x-y﹚﹙2x-5y﹚]÷﹙-1/3x﹚初一
(x+3y)/﹙x²-y²﹚-(x+2y)/(x²-y²)+﹙2x-3y﹚/﹙x
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}
(3x-³y-²)²÷9×﹙⅓x²y-¹﹚³