Bất phương trình <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-mstyle" id="MJXp-Span-3"><span class="MJXp-mfrac" id="MJXp-Span-4" style="vertical-align: 0.25em;"><span class="MJXp-box"><span class="MJXp-mn" id="MJXp-Span-5">3</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-6">x</span><span class="MJXp-mo" id="MJXp-Span-7" style="margin-left: 0.267em; margin-right: 0.267em;">+</span><span class="MJXp-mn" id="MJXp-Span-8">5</span></span><span class="MJXp-box" style="margin-top: -0.9em;"><span class="MJXp-denom"><span><span class="MJXp-rule" style="height: 1em; border-top: none; border-bottom: 1px solid; margin: 0.1em 0px;"></span></span><span><span class="MJXp-box"><span class="MJXp-mn" id="MJXp-Span-9">2</span></span></span></span></span></span></span><span class="MJXp-mo" id="MJXp-Span-10" style="margin-left: 0.267em; margin-right: 0.267em;">−</span><span class="MJXp-mn" id="MJXp-Span-11">1</span><span class="MJXp-mo" id="MJXp-Span-12" style="margin-left: 0.333em; margin-right: 0.333em;">≤</span><span class="MJXp-mstyle" id="MJXp-Span-13"><span class="MJXp-mfrac" id="MJXp-Span-14" style="vertical-align: 0.25em;"><span class="MJXp-box"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-15">x</span><span class="MJXp-mo" id="MJXp-Span-16" style="margin-left: 0.267em; margin-right: 0.267em;">+</span><span class="MJXp-mn" id="MJXp-Span-17">2</span></span><span class="MJXp-box" style="margin-top: -0.9em;"><span class="MJXp-denom"><span><span class="MJXp-rule" style="height: 1em; border-top: none; border-bottom: 1px solid; margin: 0.1em 0px;"></span></span><span><span class="MJXp-box"><span class="MJXp-mn" id="MJXp-Span-18">3</span></span></span></span></span></span></span><span class="MJXp-mo" id="MJXp-Span-19" style="margin-left: 0.267em; margin-right: 0.267em;">+</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-20">x</span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large \dfrac{3x+5}{2}-1\le \dfrac{x+2}{3}+x</script> có ngh

Bất phương trình 3x+521x+23+x có ngh

4.8/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Câu hỏi:

Bất phương trình 3x+521x+23+x có nghiệm là:

Đáp án án đúng là: D

Lời giải chi tiết:

Ta có:

3x+521x+23+x3(3x+5)6662(x+2)6+6x63(3x+5)62(x+2)+6x9x+1562x+4+6x9x2x6x415+6x5

Vậy nghiệm của bất phương trình là x5