Xét <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">I</span><span class="MJXp-mo" id="MJXp-Span-4" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-msubsup" id="MJXp-Span-5"><span class="MJXp-mo" id="MJXp-Span-6" style="margin-left: 0em; margin-right: 0.05em;">∫</span><span class="MJXp-script-box" style="height: 2.004em; vertical-align: -0.64em;"><span class=" MJXp-script"><span><span style="margin-bottom: -0.25em;"><span class="MJXp-mrow" id="MJXp-Span-9"><span class="MJXp-msqrt" id="MJXp-Span-10"><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-11">3</span></span></span></span></span></span></span></span><span class=" MJXp-script"><span><span style="margin-top: -1.03em;"><span class="MJXp-mrow" id="MJXp-Span-7"><span class="MJXp-mn" id="MJXp-Span-8">0</span></span></span></span></span></span></span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-12">x</span><span class="MJXp-mo" id="MJXp-Span-13" style="margin-left: 0em; margin-right: 0.222em;">.</span><span class="MJXp-msubsup" id="MJXp-Span-14"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-15" style="margin-right: 0.05em;">e</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-16" style="vertical-align: 0.5em;"><span class="MJXp-msqrt" id="MJXp-Span-17"><span class="MJXp-surd"><span class="MJXp-right MJXp-scale10" style="font-size: 166%; margin-top: 0.084em; margin-left: 0em;">√</span></span><span class="MJXp-root"><span class="MJXp-rule" style="border-top: 0.08em solid;"></span><span class="MJXp-box"><span class="MJXp-msubsup" id="MJXp-Span-18"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-19" style="margin-right: 0.05em;">x</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-20" style="vertical-align: 0.5em;"><span class="MJXp-mn" id="MJXp-Span-21">2</span></span></span><span class="MJXp-mo" id="MJXp-Span-22">+</span><span class="MJXp-mn" id="MJXp-Span-23">1</span></span></span></span></span></span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-24">d</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-25">x</span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large I = \int_{0}^{\sqrt{3}} x.e^{\sqrt{x^{2}+1}} dx</script>. Nếu đặt

Xét I=30x.ex2+1dx. Nếu đặt

4.2/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Câu hỏi:

Xét I=30x.ex2+1dx. Nếu đặt t=x2+1 thì I bằng

Đáp án án đúng là: C

Lời giải chi tiết:

Đặt t=x2+1. Khi đó t2=x2+1, suy ra 2t dt=2x dx hay xdx=tdt

Với x = 0 thì t = 1; với x=3 thì t = 2

Do đó, I=21tetdt