Cho a là số thực dương khác 1. Tính <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-1"><span class="MJXp-mstyle" id="MJXp-Span-2"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-3">I</span><span class="MJXp-mo" id="MJXp-Span-4" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-msubsup" id="MJXp-Span-5"><span class="MJXp-mi" id="MJXp-Span-6" style="margin-right: 0.05em;">log</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-7" style="vertical-align: -0.4em;"><span class="MJXp-msqrt" id="MJXp-Span-8"><span class="MJXp-surd"><span style="font-size: 134%; margin-top: 0.104em;">√</span></span><span class="MJXp-root"><span class="MJXp-rule" style="border-top: 0.08em solid;"></span><span class="MJXp-box"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-9">a</span></span></span></span></span></span><span class="MJXp-mo" id="MJXp-Span-10" style="margin-left: 0em; margin-right: 0em;"></span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-11">a</span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large I=\log