a) Ta có: \(54⋮x;120⋮x;180⋮x\Rightarrow x\inƯC\left(54;120;180\right)\) \(\left(x\in N\right)\)
\(\Rightarrow x=\left\{1;2;3;6\right\}\)
b) Theo đề bài \(\Rightarrow x-3\inƯC\left(45;54\right)\left(x\in N\right);\left(x>9\right)\)
\(\Rightarrow x-3=9\Rightarrow x=12\)
c) Tương tự