Tính nhanh: <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-1"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-2">C</span><span class="MJXp-mo" id="MJXp-Span-3" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-mn" id="MJXp-Span-4">32</span><span class="MJXp-mo" id="MJXp-Span-5" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-mn" id="MJXp-Span-6">18</span><span class="MJXp-mo" id="MJXp-Span-7" style="margin-left: 0.267em; margin-right: 0.267em;">+</span><span class="MJXp-mn" id="MJXp-Span-8">36</span><span class="MJXp-mo" id="MJXp-Span-9" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-mn" id="MJXp-Span-10">42</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">13</span><span class="MJXp-mo" id="MJXp-Span-13" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-mn" id="MJXp-Span-14">93</span><span class="MJXp-mo" id="MJXp-Span-15" style="margin-left: 0em; margin-right: 0.222em;">–</span><span class="MJXp-mo" id="MJXp-Span-16" style="margin-left: 0em; margin-right: 0em;">(</span><span class="MJXp-mn" id="MJXp-Span-17">2</span><span class="MJXp-mo" id="MJXp-Span-18" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-mn" id="MJXp-Span-19">18</span><span class="MJXp-mo" id="MJXp-Span-20" style="margin-left: 0.267em; margin-right: 0.267em;">+</span><span class="MJXp-mn" id="MJXp-Span-21">6</span><span class="MJXp-mo" id="MJXp-Span-22" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-mn" id="MJXp-Span-23">42</span><span class="MJXp-mo" id="MJXp-Span-24" style="margin-left: 0.267em; margin-right: 0.267em;">+</span><span class="MJXp-mn" id="MJXp-Span-25">3</span><span class="MJXp-mo" id="MJXp-Span-26" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-mn" id="MJXp-Span-27">93</span><span class="MJXp-mo" id="MJXp-Span-28" style="margin-left: 0em; margin-right: 0em;">)</span></span></span><script type="math/tex" id="MathJax-Element-1">C = 32,18 + 36,42 + 13,93 – (2,18 + 6,42 + 3,93)</script> 60 70 8

Tính nhanh: $C = 32,18 + 36,42 + 13,93 – (2,18 + 6,42 + 3,93)$ 60 70 8

4.3/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Lời giải chi tiết

Câu hỏi:

Tính nhanh: $C = 32,18 + 36,42 + 13,93 – (2,18 + 6,42 + 3,93)$

A. 60
B. 70
C. 80
D. 90

Đáp án án đúng là: C

Lời giải chi tiết:

$C = 32,18 + 36,42 + 23,93 – (2,18 + 6,42 + 3,93) = (32,18-2,18)+(36,42-6,42)+(23,93-3,93) = 30+30+20 = 80$

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