Cho hai 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-msubsup" id="MJXp-Span-3"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-4" style="margin-right: 0.05em;">z</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-5" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-6">1</span></span></span><span class="MJXp-mo" id="MJXp-Span-7" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-mn" id="MJXp-Span-8">1</span><span class="MJXp-mo" id="MJXp-Span-9" style="margin-left: 0.267em; margin-right: 0.267em;">+</span><span class="MJXp-mn" id="MJXp-Span-10">2</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-11">i</span></span></span></span><script type="math/tex" id="MathJax-Element-1">\large z_{1} = 1 + 2i</script>, <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-12"><span class="MJXp-mstyle" id="MJXp-Span-13"><span class="MJXp-msubsup" id="MJXp-Span-14"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-15" style="margin-right: 0.05em;">z</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-16" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-17">2</span></span></span><span class="MJXp-mo" id="MJXp-Span-18" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-mn" id="MJXp-Span-19">3</span><span class="MJXp-mo" id="MJXp-Span-20" style="margin-left: 0.267em; margin-right: 0.267em;">−</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-21">i</span></span></span></span><script type="math/tex" id="MathJax-Element-2">\large z_{2} = 3 - i</script>. Tìm s

Cho hai số phức z1=1+2i, z2=3i. Tìm s

4.3/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Câu hỏi:

Cho hai số phức z1=1+2i, z2=3i. Tìm số phức z=z2z1

Đáp án án đúng là: C

Lời giải chi tiết:

z=z2z1=3i1+2i=(12i)(3i)(12i)(1+2i)=17i5=1575i