Question

Tính:

a) 0,27777... + 0,3555...

b) 1 : 10,2(6) : 0,41(6) . 0,42(7)

Giúp mk dzới ah 

Answer 1

a: \(0.2\left(7\right)+0.3\left(5\right)\)

\(=\dfrac{5}{18}+\dfrac{16}{45}\)

\(=\dfrac{225}{810}+\dfrac{288}{810}\)

\(=\dfrac{19}{30}\)