Question

chứng minh rằng : 9^2007+3^2004 chia hết cho 5

 

Answer 1

Ta có : 9²⁰⁰⁷ + 3²⁰⁰⁴ = 9^4.501.9³ + 3^4.501 = (.....1) . (.....9) + (......1) = (......9) + (......1) = (......0)

Vì 9²⁰⁰⁷ + 3²⁰⁰⁴ có chữ số tận cũng là 0

Nên 9²⁰⁰⁷ + 3²⁰⁰⁴ chai hết cho 5

Answer 2

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