Giá trị của <span class="MathJax_Preview" style="color: inherit; display: none;"></span><span id="MathJax-Element-1-Frame" class="mjx-chtml MathJax_CHTML" 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: 144%;"><span id="MJXc-Node-5" class="mjx-texatom"><span id="MJXc-Node-6" class="mjx-mrow"><span id="MJXc-Node-7" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">l</span></span><span id="MJXc-Node-8" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">i</span></span><span id="MJXc-Node-9" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.15em; padding-bottom: 0.347em;">m</span></span></span></span><span id="MJXc-Node-10" class="mjx-mstyle"><span id="MJXc-Node-11" class="mjx-mrow"><span id="MJXc-Node-12" class="mjx-mfrac"><span class="mjx-box MJXc-stacked" style="width: 3.511em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 3.511em; top: -1.528em;"><span id="MJXc-Node-13" class="mjx-mrow"><span id="MJXc-Node-14" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">3</span></span><span id="MJXc-Node-15" class="mjx-msubsup"><span class="mjx-base"><span id="MJXc-Node-16" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.199em; padding-bottom: 0.298em;">n</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-17" class="mjx-mn" style=""><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">2</span></span></span></span><span id="MJXc-Node-18" 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-19" class="mjx-mi MJXc-space2"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.199em; padding-bottom: 0.298em;">n</span></span></span></span><span class="mjx-denominator" style="width: 3.511em; bottom: -0.759em;"><span id="MJXc-Node-20" class="mjx-msubsup"><span class="mjx-base"><span id="MJXc-Node-21" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.199em; padding-bottom: 0.298em;">n</span></span></span><span class="mjx-sup" style="font-size: 70.7%; vertical-align: 0.409em; padding-left: 0px; padding-right: 0.071em;"><span id="MJXc-Node-22" class="mjx-mn" style=""><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">2</span></span></span></span></span><span class="mjx-line" style="border-bottom: 1.8px solid; top: -0.281em; width: 3.511em;"></span></span><span class="mjx-vsize" style="height: 2.287em; vertical-align: -0.759em;"></span></span></span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large \mathrm{lim}\dfrac{3n^2+n}{n^2}</script> bằng: $\Large +\i

Giá trị của lim3n2+nn2 bằng: $\Large +\i

4.3/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

Lưu về Facebook:

Câu hỏi:

Giá trị của lim3n2+nn2 bằng:

Đáp án án đúng là: A

Lời giải chi tiết:

Chọn A.

Với mọi M>0 lớn tùy ý, ta chọn nM=[M3]+1

Ta có: 3n2+nn2=3n+1n>Mn>nM

Vậy lim3n2+nn2=+.