Question

viết vào chỗ chấm

4/9(2/9+5/70)

Answer 1

Where is chỗ chấm?

Answer 2

\(\dfrac{4}{9}+\left(\dfrac{2}{9}+\dfrac{5}{70}\right)\)

\(=\dfrac{4}{9}+\left(\dfrac{2}{9}+\dfrac{1}{14}\right)\)

\(=\dfrac{4}{9}+\left(\dfrac{28}{126}+\dfrac{9}{126}\right)\)

\(=\dfrac{4}{9}+\dfrac{37}{126}\)

\(=\dfrac{56}{126}+\dfrac{37}{126}\)

\(=\dfrac{31}{42}\)