Số thích hợp điền vào chỗ chấm để <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-mn" id="MJXp-Span-3">3</span><span class="MJXp-msubsup" id="MJXp-Span-4"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-5" style="margin-right: 0.05em;">m</span><span class="MJXp-mn MJXp-script" id="MJXp-Span-6" style="vertical-align: 0.5em;">2</span></span><span class="MJXp-mn" id="MJXp-Span-7">5</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-8">d</span><span class="MJXp-msubsup" id="MJXp-Span-9"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-10" style="margin-right: 0.05em;">m</span><span class="MJXp-mn MJXp-script" id="MJXp-Span-11" style="vertical-align: 0.5em;">2</span></span><span class="MJXp-mo" id="MJXp-Span-12" style="margin-left: 0.333em; margin-right: 0.333em;">=</span><span class="MJXp-mo" id="MJXp-Span-13" style="margin-left: 0em; margin-right: 0em;">…</span><span class="MJXp-msubsup" id="MJXp-Span-14"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-15" style="margin-right: 0.05em;">m</span><span class="MJXp-mn MJXp-script" id="MJXp-Span-16" style="vertical-align: 0.5em;">2</span></span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large 3m^2 5dm^2 = … m^2</script> 3,5 3,