Question

[Lê Thúy Hà]

Tính bằng cách thuận tiện:

a.

b.

Answer 1

[Nguyễn Lê Phước Thịnh]

a: \(\dfrac{16}{15}+\dfrac{67}{27}-\dfrac{5}{9}+\dfrac{8}{5}\)

\(=\left(\dfrac{16}{15}+\dfrac{8}{5}\right)+\left(\dfrac{67}{27}-\dfrac{5}{9}\right)\)

\(=\dfrac{16+24}{15}+\dfrac{67-15}{27}\)

\(=\dfrac{40}{15}+\dfrac{52}{27}=\dfrac{124}{27}\)

b: \(\dfrac{37}{7}+\dfrac{123}{15}-\dfrac{6}{5}+\dfrac{26}{7}\)

\(=\left(\dfrac{37}{7}+\dfrac{26}{7}\right)+\left(\dfrac{123}{15}-\dfrac{6}{5}\right)\)

\(=\dfrac{63}{7}+\left(\dfrac{41}{5}-\dfrac{6}{5}\right)\)

\(=9+\dfrac{35}{5}=9+7=16\)