Question

2.5 + 19/10+4/15 -1 + 5/15

giúp m vơi

Answer 1

=10 + 19/10 + 4/15 -1 + 5/15 

= 10 - 1 + 4/15 + 5/15 + 19/10

= 9 + 9/15 + 19/10

= 135/15 + 9/15 + 19/10

= 144/15 + 19/15

=...

Answer 2

\(\dfrac{2}{5}+\dfrac{19}{10}+\dfrac{4}{15}-1+\dfrac{5}{15}\)

\(=\dfrac{2}{5}+\dfrac{4}{15}+\dfrac{5}{15}+\dfrac{9}{10}\)

\(=\dfrac{2}{5}+\dfrac{3}{5}+\dfrac{9}{10}\)

\(=\dfrac{19}{10}\)