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-mi" id="MJXp-Span-4" style="margin-right: 0.05em;">log</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-5" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-6">3</span></span></span><span class="MJXp-mo" id="MJXp-Span-7" style="margin-left: 0em; margin-right: 0em;"></span><span class="MJXp-mn" id="MJXp-Span-8">5</span><span class="MJXp-mo" id="MJXp-Span-9" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-10">a</span><span class="MJXp-mo" id="MJXp-Span-11" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-msubsup" id="MJXp-Span-12"><span class="MJXp-mi" id="MJXp-Span-13" style="margin-right: 0.05em;">log</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-14" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-15">3</span></span></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">6</span><span class="MJXp-mo" id="MJXp-Span-18" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-19">b</span><span class="MJXp-mo" id="MJXp-Span-20" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-msubsup" id="MJXp-Span-21"><span class="MJXp-mi" id="MJXp-Span-22" style="margin-right: 0.05em;">log</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-23" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-24">3</span></span></span><span class="MJXp-mo" id="MJXp-Span-25" style="margin-left: 0em; margin-right: 0em;"></span><span class="MJXp-mn" id="MJXp-Span-26">22</span><span class="MJXp-mo" id="MJXp-Span-27" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-28">c</span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large \log_{3}5=a, \log_{3}6=b, \log_{3}22=c</script>. Mệnh đề nào sau đ

Cho log35=a,log36=b,log322=c. Mệnh đề nào sau đ

4.6/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Câu hỏi:

Cho log35=a,log36=b,log322=c. Mệnh đề nào sau đây là đúng?

Đáp án án đúng là: A

Lời giải chi tiết:

Chọn A

log36=blog3(3.2)=b1+log32=blog32=b1log322=clog3(11.2)=clog311+log32=clog311=clog32=cb+1log3(270121)=log3(2.33.5112)=log3(2.33.5)2log311=log32+3+log352log311=b1+3+a2(cb+1)=a+3b2c