Ta có : \(\overline{2a456b}⋮2,3,5,9\) Mà : \(\overline{2a456b}⋮2,5\Rightarrow b=0\)
Mà : \(\overline{2a4560}⋮9\)
\(\Rightarrow2+a+4+5+6+0⋮9\)
\(\Rightarrow a+17⋮9\)
\(\Rightarrow\left(a+8\right)+9⋮9\)
Vì : \(9⋮9\Rightarrow a+8⋮9\)
Mà : a + 8 là chữ số .
\(\Rightarrow a+8=9\Rightarrow a=9-8\Rightarrow a=1\)
Vì : a = 1 và b = 0 => a + b = 1 + 0 = 1
Vậy a + b = 1
Toán tiếng anh:
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