Minh muon giup lam nhung hong duoc
b,c tương tự câu trên nha:
a,\(UCLN\left(a,b\right)=10\Rightarrow\left\{{}\begin{matrix}a=10a`\\b=10b`\end{matrix}\right.với:UCLN\left(a`,b`\right)=1va:a`>b`\left(vìa>b\right).Taco:ab=UCLN\left(a,b\right).BCNN\left(a,b\right)\Rightarrow100a`b`=10.BCNN\left(a,b\right)\Rightarrow BCNN\left(a,b\right)=10a`b`=120\Rightarrow a`b`=12va:a`>b`vaUCLN\left(a`,b`\right)=1\Rightarrow\left(a`,b`\right)\in\left\{\left(12;1\right),\left(4;3\right)\right\}\Rightarrow\left(a,b\right)\in\left\{\left(120;10\right),\left(40;30\right)\right\}\)