Question

Tính Hợp Lí
a, 732 : 12 - 246 : 6 +19
b,  546 : 26 - 156 : 13

Answer 1

a) \(732:12-246:6+19\)

\(=366:6-246:6+19\)

\(=366.\dfrac{1}{6}-246.\dfrac{1}{6}+19\)

\(=\dfrac{1}{6}\left(366-246\right)+19\)

\(=\dfrac{1}{6}.120+19\)

\(=20+19=39\)

b) \(546:26-156:13\)

\(=273:13-156:13\)

\(=273.\dfrac{1}{13}-156.\dfrac{1}{13}\)

\(=\dfrac{1}{3}\left(273-156\right)\)

\(=\dfrac{1}{3}.117=39\)