观察下列各式:
(x2-1)÷(x-1)=x+1
(x3-1)÷(x-1)=x2+x+1
(x4-1)÷(x-1)=x3+x2+x+1
(x5-1)÷(x-1)=x4+x3+x2+x+1
… …
(1)写出第5个式子: ;
(2)请用n表示出你所得到的规律.(中间可用省略号表示,例如x10+x9+…+x+1)
(3)根据公式计算:1+2+22+…+262+263的值.
更新时间:2017-09-02 13:28:39
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