2 câu trả lời
$\begin{array}{l} \dfrac{5}{{x - 2}} = \dfrac{{15}}{6}\\ Cach1\,\,:\\ Ta\,\,co\,\,\,:\dfrac{{15}}{6} = \dfrac{{15:3}}{{6:3}} = \dfrac{5}{2}\\ \Rightarrow \dfrac{5}{{x - 2}} = \dfrac{5}{2}\\ \Rightarrow x - 2 = 2\\ \,\,\,\,\,\,\,x = 2 + 2\\ \,\,\,\,\,\,\,x = 4\\ Cach\,2\,\,:\,\,\,\,\\ \dfrac{5}{{x - 2}} = \dfrac{{15}}{6}\\ \Rightarrow 5.6 = 15.\left( {x - 2} \right)\\ \,\,\,\,\,\,\,30 = 15\left( {x - 2} \right)\\ \,\,\,\,\,\,x - 2 = 30:15\\ \,\,\,\,\,\,x - 2 = 2\\ \,\,\,\,\,\,\,x = 2 + 2\\ \,\,\,\,\,\,\,x = 4 \end{array}$
Đáp án: 5/x-2=15/6
<=>5.6 =(x-2).15
<=>30 =15x-30
<=>15x =30+30
<=>15x =60
<=>x =60/15
<=>x =4
