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
题型:单选题难度:简单来源:不详
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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答案
原式=x3(x2+x+1)-(x3-1) =x3(x2+x+1)-(x-1)(x2+x+1) =(x2+x+1)(x3-x+1) 故选D. |
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