摘要：4．用数学归纳法证明当n∈N*时1+2+22+23+-+25n-1是31的倍数时.当n＝1时原式为 .从k→k+1时需增添的项是 ． 解析:把n＝k.n＝k+1相比较即可得出． 答案:1+2+22+23+24 25k+25k+1+25k+2+25k+3+25k+4
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用数学归纳法证明“当n∈N*时，1+2+22+23+…+25n-1是31的倍数”时，从k到k+1时需添加的项是
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25k+25k+1+25k+2+25k+3+25k+4
25k+25k+1+25k+2+25k+3+25k+4
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