9.1归纳法证明

用归纳法证明，对于所有正整数n,{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="n逗号" style="vertical-align:-6px;height:22px;width:16px" loading="lazy">

3061n=3n03(3n-1)1{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="开括号表第30行第6行1结束表右括号的n次方等于开括号表第3行单元格的n次方结束单元格第0行单元格第3左括号3的n - 1次方右括号结束单元格第1结束表右括号" style="vertical-align:-22px;height:56px;width:177px" loading="lazy">

用归纳法证明n∈ℤ+{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="N个元素的正整数次方" style="vertical-align:-6px;height:23px;width:48px" loading="lazy">

∑r=1n(3r+1)(r+2)=n(n+2)(n+3){"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="从r = 1到n的和左括号3r + 1右括号r + 2右括号等于n左括号n + 2右括号左括号n + 3右括号" style="vertical-align:-20px;height:55px;width:247px" loading="lazy">

用归纳法证明，对所有正数奇怪的整数n{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="n" style="vertical-align:-6px;height:22px;width:11px" loading="lazy">

 f(n)=4n+5n+6n{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="空格f左括号n右括号等于4的n次方加上5的n次方加上6的n次方" style="vertical-align:-6px;height:23px;width:138px" loading="lazy">

能被15整除吗

用归纳法证明，对于所有正整数n{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="n" style="vertical-align:-6px;height:22px;width:11px" loading="lazy">

 f(n)=32n+4-22n{"language":"en","fontFamily":"Times New Roman","fontSize":"18"}" class="Wirisformula" role="math" alt="空格f左括号n右括号等于3的2n次方加上4个末端指数减去2的2n次方" style="vertical-align:-6px;height:23px;width:137px" loading="lazy">

能被5整除吗