Rút gọn biểu thức <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">P</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 MJXp-italic" id="MJXp-Span-6" style="margin-right: 0.05em;">x</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-7" style="vertical-align: 0.5em;"><span class="MJXp-mfrac" id="MJXp-Span-8" style="vertical-align: 0.25em;"><span class="MJXp-box MJXp-script"><span class="MJXp-mn" id="MJXp-Span-9">1</span></span><span class="MJXp-box" style="margin-top: -0.9em;"><span class="MJXp-denom"><span><span class="MJXp-rule" style="height: 1em; border-top: none; border-bottom: 1px solid; margin: 0.1em 0px;"></span></span><span><span class="MJXp-box MJXp-script"><span class="MJXp-mn" id="MJXp-Span-10">5</span></span></span></span></span></span></span></span><span class="MJXp-mo" id="MJXp-Span-11" style="margin-left: 0em; margin-right: 0.222em;">.</span><span class="MJXp-mroot" id="MJXp-Span-12"><span class="MJXp-script" style="margin-right: -0.67em; vertical-align: 0.854em;"><span class="MJXp-mn" id="MJXp-Span-14">3</span><span class="MJXp-mspace" id="MJXp-Span-15" style="width: 0.167em; height: 0em;"></span><span class="MJXp-mspace" id="MJXp-Span-16" style="width: 0.167em; height: 0em;"></span><span class="MJXp-mspace" id="MJXp-Span-17" style="width: 0.167em; height: 0em;"></span><span class="MJXp-mspace" id="MJXp-Span-18" style="width: 0.167em; height: 0em;"></span></span><span><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-13">x</span></span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large P=x^{\frac{1}{5}}.\sqrt[3\,\,\,\,]{x}</script> với $

Rút gọn biểu thức P=x15.3x với $

4/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Câu hỏi:

Rút gọn biểu thức P=x15.3x với x>0.

Đáp án án đúng là: C

Lời giải chi tiết:

Chọn C

Với x>0 ta có: P=x15.3x=x15.x13=x15+13=x815.