Cho đường cong <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-mtext" id="MJXp-Span-3"> ( </span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-4">C</span><span class="MJXp-mo" id="MJXp-Span-5" style="margin-left: 0em; margin-right: 0em;">)</span><span class="MJXp-mo" id="MJXp-Span-6" style="margin-left: 0.111em; margin-right: 0.167em;">:</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-7">y</span><span class="MJXp-mo" id="MJXp-Span-8" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-msubsup" id="MJXp-Span-9"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-10" style="margin-right: 0.05em;">x</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-11" style="vertical-align: 0.5em;"><span class="MJXp-mn" id="MJXp-Span-12">3</span></span></span><span class="MJXp-mo" id="MJXp-Span-13" style="margin-left: 0.267em; margin-right: 0.267em;">−</span><span class="MJXp-mn" id="MJXp-Span-14">3</span><span class="MJXp-msubsup" id="MJXp-Span-15"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-16" style="margin-right: 0.05em;">x</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-17" style="vertical-align: 0.5em;"><span class="MJXp-mn" id="MJXp-Span-18">2</span></span></span></span></span></span><span id="MathJax-Element-1-Frame" class="mjx-chtml MathJax_CHTML MJXc-processed" tabindex="0" style="font-size: 127%;"><span id="MJXc-Node-1" class="mjx-math"><span id="MJXc-Node-2" class="mjx-mrow"><span id="MJXc-Node-3" class="mjx-mstyle"><span id="MJXc-Node-4" class="mjx-mrow" style="font-size: 120%;"><span id="MJXc-Node-5" class="mjx-mtext"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.445em; padding-bottom: 0.593em;"> ( </span></span><span id="MJXc-Node-6" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.495em; padding-bottom: 0.298em; padding-right: 0.045em;">C</span></span><span id="MJXc-Node-7" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.445em; padding-bottom: 0.593em;">)</span></span><span id="MJXc-Node-8" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.15em; padding-bottom: 0.347em;">:</span></span><span id="MJXc-Node-9" class="mjx-mi MJXc-space3"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.199em; padding-bottom: 0.495em; padding-right: 0.006em;">y</span></span><span id="MJXc-Node-10" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.101em; padding-bottom: 0.298em;">=</span></span><span id="MJXc-Node-11" class="mjx-msubsup MJXc-space3"><span class="mjx-base"><span id="MJXc-Node-12" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.199em; padding-bottom: 0.298em;">x</span></span></span><span class="mjx-sup" style="font-size: 70.7%; vertical-align: 0.513em; padding-left: 0px; padding-right: 0.071em;"><span id="MJXc-Node-13" class="mjx-texatom" style=""><span id="MJXc-Node-14" class="mjx-mrow"><span id="MJXc-Node-15" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">3</span></span></span></span></span></span><span id="MJXc-Node-16" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.445em;">−</span></span><span id="MJXc-Node-17" class="mjx-mn MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">3</span></span><span id="MJXc-Node-18" class="mjx-msubsup"><span class="mjx-base"><span id="MJXc-Node-19" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.199em; padding-bottom: 0.298em;">x</span></span></span><span class="mjx-sup" style="font-size: 70.7%; vertical-align: 0.513em; padding-left: 0px; padding-right: 0.071em;"><span id="MJXc-Node-20" class="mjx-texatom" style=""><span id="MJXc-Node-21" class="mjx-mrow"><span id="MJXc-Node-22" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">2</span></span></span></span></span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-1">\large \text { ( } C): y=x^{3}-3 x^{2}</script>. Viết phương t

Cho đường cong  ( C):y=x33x2 ( C):y=x33x2. Viết phương t

4.5/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Câu hỏi:

Cho đường cong  ( C):y=x33x2 ( C):y=x33x2. Viết phương trình tiếp tuyến của (C) tại điểm thuộc (C) có hoành độ x0=1x0=1

Đáp án án đúng là: D

Lời giải chi tiết:

Chọn D

Ta có y=3x26x

Với x0=1y0=4,y(1)=9

Vậy phương trình tiếp tuyến tại (-1;-4) là y=9(x+1)4=9x+5