Question

(2/7 + 4/9 ) +5/7

Answer 1

46/63 +5/7=13/9

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Answer 2

Kết quả là 13/9

Answer 3

\(\left(\frac{2}{7}+\frac{4}{9}\right)+\frac{5}{7}\)

\(=\left(\frac{18}{63}+\frac{28}{63}\right)+\frac{5}{7}\)

\(=\frac{46}{63}+\frac{5}{7}\)

\(=\frac{46}{63}+\frac{45}{63}\)

\(=\frac{13}{9}\)