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(X+Y)的三次方+(X+Y)的二次方-(-X-Y)
用因式分解
人气:251 ℃ 时间:2019-09-21 06:14:56
解答

(x+y)³+(x+y)²-(-x-y)
=(x+y)³+(x+y)²+(x+y)
=(x+y)[(x+y)²+(x+y)+1]
=(x+y)(x²+2xy+y²+x+y+1)
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