Tính nhanh: <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-1"><span class="MJXp-mn" id="MJXp-Span-2">2</span><span class="MJXp-mo" id="MJXp-Span-3" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-mn" id="MJXp-Span-4">5</span><span class="MJXp-mo" id="MJXp-Span-5" style="margin-left: 0.267em; margin-right: 0.267em;">×</span><span class="MJXp-mn" id="MJXp-Span-6">9</span><span class="MJXp-mo" id="MJXp-Span-7" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-mn" id="MJXp-Span-8">7</span><span class="MJXp-mo" id="MJXp-Span-9" style="margin-left: 0.267em; margin-right: 0.267em;">×</span><span class="MJXp-mn" id="MJXp-Span-10">4</span></span></span><script type="math/tex" id="MathJax-Element-1">2,5 \times 9,7 \times 4</script> 95 97 99 79 $2,5 \times 9,7 \tim