观察下面各式 ﹙x-1﹚﹙x+1﹚=x²-1 ﹙x-1﹚﹙x²+x+1﹚=x³-1
1个回答
(x-1)(x^63+x^62+x^61+x^60+.x^3+x^2+x+1)=x^64-1
令x=2得到
1+2+2^2+2^3+.+2^63=2^64-1
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