(a+1)(a^2+a\2+1)与(a+1\2)(a^2+a+1)
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(a+1)(a^2+a\2+1)与(a+1\2)(a^2+a+1)
(a+1)(a^2+a\2+1)与(a+1\2)(a^2+a+1)
(a+1)(a^2+a\2+1)与(a+1\2)(a^2+a+1)
我看不懂^是什么,但是你可以用一个数带进去算,就是特殊值法,然后比出大小