Question

cho A = 120a + 36b ( a, b ∈ N ) c/m rằng A \(⋮\) 12

Answer 1

A = 120a + 36b

A = 12.(10a + 3b) ⋮ 12

Vậy...

Answer 2

A=120a+36b

Tách 120a=12(10+a) 36b=12(3+b)

Ta có : A = 12(10a+3b)

A.........

Answer 3

A=120a+36b

A=12×(10a+3a)÷12

Vậy.......