Ta có:
\(\hept{\begin{cases}72⋮x\\60⋮x\end{cases}\Rightarrow\hept{\begin{cases}x\inƯ\left(72\right)\\x\inƯ\left(60\right)\end{cases}\Rightarrow}x\inƯC\left(72,60\right)}\)
Ta có:ƯCLN(70;60)=12
=>ƯC(72;60)=Ư(12)={\(\pm1;\pm2;\pm3;\pm4;\pm6;\pm12\)}
Vì x>6 nên x=12
72 / 60 = 1.2
1.2*10 = 12
=> x=12 (vi: 72 / 12 = 6; 60 / 12 = 5)