\(\frac{144.18}{84.27}=\frac{12.3.4.2.9}{12.7.3.9}=\frac{4.2}{7}=\frac{8}{7}\)

" . " là nhân nhé

1. Lan goes to school every afternoon.

- Lan doesn't go to school every afternoon.

? Does Lan go to school very afternoon.

2. He is a doctor.

- He isn't a doctor.

? Is he a doctor?

Ta có: \(3^n.15^2=3^n.3^2.5^2=3^{n+2}.5^2\)

Ta có: ( n + 2 + 1)((2 + 1) = 15

( n + 3) . 3 = 15

n + 3 = 5

n = 2

Vậy n = 2