Cho hàm số <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">f</span><span class="MJXp-mo" id="MJXp-Span-4" style="margin-left: 0em; margin-right: 0em;">(</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-5">x</span><span class="MJXp-mo" id="MJXp-Span-6" style="margin-left: 0em; margin-right: 0em;">)</span><span class="MJXp-mo" id="MJXp-Span-7" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-mo" id="MJXp-Span-8" style="margin-left: 0em; margin-right: 0em;">(</span><span class="MJXp-mn" id="MJXp-Span-9">2</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-10">x</span><span class="MJXp-mo" id="MJXp-Span-11" style="margin-left: 0.267em; margin-right: 0.267em;">−</span><span class="MJXp-mn" id="MJXp-Span-12">3</span><span class="MJXp-msubsup" id="MJXp-Span-13"><span class="MJXp-mo" id="MJXp-Span-14" style="margin-left: 0em; margin-right: 0.05em;">)</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-15" style="vertical-align: 0.5em;"><span class="MJXp-mstyle" id="MJXp-Span-16"><span class="MJXp-mfrac" id="MJXp-Span-17" style="vertical-align: 0.25em;"><span class="MJXp-box"><span class="MJXp-mn" id="MJXp-Span-18">5</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"><span class="MJXp-mn" id="MJXp-Span-19">6</span></span></span></span></span></span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large f(x)=(2x-3)^{\dfrac{5}{6}}</script>. Tính <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-20"><span class="MJXp-mstyle" id="MJXp-Span-21"><span class="MJXp-msup" id="MJXp-Span-22"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-23" style="margin-right: 0.05em;">f</span><span class="MJXp-mo MJXp-script" id="MJXp-Span-24" style="vertical-align: 0.5em;">′</span></span><span class="MJXp-mo" id="MJXp-Span-25" style="margin-left: 0em; margin-right: 0em;">(</span><span class="MJXp-mn" id="MJXp-Span-26">2</span><span class="MJXp-mo" id="MJXp-Span-27" style="margin-left: 0em; margin-right: 0em;">)</span></span></span></span><script type="math/tex" id="MathJax-Element-2">\Large f'(2)</script> A.

Cho hàm số f(x)=(2x3)56. Tính f(2) A.

4.1/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Câu hỏi:

Cho hàm số f(x)=(2x3)56. Tính f(2)

 

Đáp án án đúng là: B

Lời giải chi tiết:

Chọn B

TXĐ: (32;+)

Ta có: f(x)=(2x3)56f(x)=53.(2x3)16f(2)=53