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将x5+x4+1因式分解得( )A.(x2+x+1)(x3+x+1)B.(x2-x+1)(x3+x+1)C.(x2-x+1)(x3-x+1)D
将x5+x4+1因式分解得( )A.(x2+x+1)(x3+x+1)B.(x2-x+1)(x3+x+1)C.(x2-x+1)(x3-x+1)D.(x2+x+1)(x3-x+1)
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推荐答案 2014-11-21
原式=x
3
(x
2
+x+1)-(x
3
-1)
=x
3
(x
2
+x+1)-(x-1)(x
2
+x+1)
=(x
2
+x+1)(x
3
-x+1)
故选D.
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