Cho <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-mo" id="MJXp-Span-4" style="margin-left: 0em; margin-right: 0.05em;">∫</span><span class="MJXp-script-box" style="height: 1.86em; vertical-align: -0.64em;"><span class=" MJXp-script"><span><span style="margin-bottom: -0.25em;"><span class="MJXp-mrow" id="MJXp-Span-6"><span class="MJXp-mn" id="MJXp-Span-7">2</span></span></span></span></span><span class=" MJXp-script"><span><span style="margin-top: -0.85em;"><span class="MJXp-mn" id="MJXp-Span-5">1</span></span></span></span></span></span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-8">f</span><span class="MJXp-mo" id="MJXp-Span-9" style="margin-left: 0em; margin-right: 0em;">(</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-10">x</span><span class="MJXp-mo" id="MJXp-Span-11" style="margin-left: 0em; margin-right: 0em;">)</span><span class="MJXp-mo" id="MJXp-Span-12" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-mn" id="MJXp-Span-13">3</span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large \int_1^{2}f(x) = 3</script>. Tính $\Large I = \int_1^{4}\dfrac{f(\

Cho 21f(x)=3. Tính $\Large I = \int_1^{4}\dfrac{f(\

4.5/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Câu hỏi:

Cho 21f(x)=3. Tính I=41f(x)xdx

Đáp án án đúng là: D

Lời giải chi tiết:

Đặt t=xt2=xdx=2tdt

I=21f(t)t.2tdt=221f(t)dt=221f(x)dx=6