计算:(x+1)(x2+x+1)(x2-x+1)=______.
题型:填空题难度:一般来源:河南
计算:(x+1)(x2+x+1)(x2-x+1)=______. |
答案
(x+1)(x2+x+1)(x2-x+1), =[(x+1)(x2-x+1)](x2+x+1), =(x3+1)(x2+x+1), =x5+x4+x3+x2+x+1. |
举一反三
下列各式中运算不正确的是( )A.2ab+3ab=5ab | B.2ab-3ab=-ab | C.2ab•3ab=6ab | D.2ab÷3ab= |
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先化简,再求值:(a-1)(a+2)-a(a-1),其中a=3. |
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