\(\Rightarrow\left\{{}\begin{matrix}a=4k\\b=4q\end{matrix}\right.\left(k,q\in N\text{*}\right)\\ a+b=48\Rightarrow4\left(k+q\right)=48\\ \Rightarrow k+q=12\)
Mà \(\left(k,q\right)=1\Rightarrow\left(k,q\right)\in\left\{\left(1,11\right);\left(11,1\right);\left(5,7\right);\left(7,5\right)\right\}\)
\(\Rightarrow\left(a,b\right)\in\left\{\left(4,44\right);\left(44,4\right);\left(20;28\right);\left(28;20\right)\right\}\)
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