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-mstyle" id="MJXp-Span-3"><span class="MJXp-mfrac" id="MJXp-Span-4" style="vertical-align: 0.25em;"><span class="MJXp-box"><span class="MJXp-mn" id="MJXp-Span-5">2</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-6">7</span></span></span></span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large \dfrac{2}{7}</script> <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-7"><span class="MJXp-mstyle" id="MJXp-Span-8"><span class="MJXp-mstyle" id="MJXp-Span-9"><span class="MJXp-mfrac" id="MJXp-Span-10" style="vertical-align: 0.25em;"><span class="MJXp-box"><span class="MJXp-mn" id="MJXp-Span-11">4</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-12">7</span></span></span></span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-2">\Large \dfrac{4}{7}</script> \(\Large \dfrac{

Tính: $\Large \dfrac{2}{7}$ $\Large \dfrac{4}{7}$ \(\Large \dfrac{

4.9/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Lời giải chi tiết

Câu hỏi:

Tính:

A. $\Large \dfrac{2}{7}$
B. $\Large \dfrac{4}{7}$
C. $\Large \dfrac{8}{21}$
D. $\Large \dfrac{10}{21}$

Đáp án án đúng là: B

Lời giải chi tiết:

$\Large \dfrac{2}{3} \times \dfrac{6}{7} = \dfrac{2 \times 6}{3 \times 7} = \dfrac{12}{21} = \dfrac{12 : 3}{21 : 3} = \dfrac{4}{7}$

Vậy đáp án đúng là $\Large \dfrac{4}{7}$ .

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