Cho số phức <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">z</span><span class="MJXp-mo" id="MJXp-Span-4" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-mn" id="MJXp-Span-5">2</span><span class="MJXp-mo" id="MJXp-Span-6" style="margin-left: 0.267em; margin-right: 0.267em;">+</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-7">i</span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large z=2+i</script>. Tính <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-8"><span class="MJXp-mstyle" id="MJXp-Span-9"><span class="MJXp-mrow" id="MJXp-Span-10"><span class="MJXp-mo" id="MJXp-Span-11" style="margin-left: 0.167em; margin-right: 0.167em;">|</span></span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-12">z</span><span class="MJXp-mrow" id="MJXp-Span-13"><span class="MJXp-mo" id="MJXp-Span-14" style="margin-left: 0.167em; margin-right: 0.167em;">|</span></span></span></span></span><script type="math/tex" id="MathJax-Element-2">\Large |z|</script> 3 <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-15"><span class="MJXp-mstyle" id="MJXp-Span-16"><span class="MJXp-msqrt" id="MJXp-Span-17"><span class="MJXp-surd"><span style="font-size: 134%; margin-top: 0.104em;">√</span></span><span class="MJXp-root"><span class="MJXp-rule" style="border-top: 0.08em solid;"></span><span class="MJXp-box"><span class="MJXp-mn" id="MJXp-Span-18">3</span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-3">\Large \sqrt{3}</script> 2 $\

Cho số phức z=2+i. Tính |z| 3 3 2 $\

4.2/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Câu hỏi:

Cho số phức z=2+i. Tính |z|

Đáp án án đúng là: D

Lời giải chi tiết:

Ta có: |z|=22+12=5