(X+Y)的三次方+(X+Y)的二次方-(-X-Y)
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(X+Y)的三次方+(X+Y)的二次方-(-X-Y)
用因式分解
用因式分解
![(X+Y)的三次方+(X+Y)的二次方-(-X-Y)](/uploads/image/z/6284675-11-5.jpg?t=%28X%2BY%29%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%2B%28X%2BY%29%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9-%28-X-Y%29)
解
(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)
(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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