Question

2/7+1/9+1/7+5/9+8/14

Answer 1

\(\dfrac{2}{7}+\dfrac{1}{9}+\dfrac{1}{7}+\dfrac{5}{9}+\dfrac{8}{14}\)

\(=\left(\dfrac{2}{7}+\dfrac{1}{7}+\dfrac{8}{14}\right)+\left(\dfrac{5}{9}+\dfrac{1}{9}\right)\)

\(=1+\dfrac{2}{3}=\dfrac{5}{3}\)

Answer 2

\(\dfrac{2}{7}+\dfrac{1}{9}+\dfrac{1}{7}+\dfrac{5}{9}+\dfrac{8}{14}\)

=\(\left(\dfrac{2}{7}+\dfrac{1}{7}\right)+\left(\dfrac{1}{9}+\dfrac{5}{9}\right)+\dfrac{8}{14}\)

=\(\dfrac{3}{7}+\dfrac{6}{9}+\dfrac{4}{7}\)

=\(\left(\dfrac{3}{7}+\dfrac{4}{7}\right)+\dfrac{2}{3}\)

=\(1+\dfrac{2}{3}\)

=\(\dfrac{5}{3}\)

Xin lỗi ban nãy gửi nhầm quá nên mk chưa làm xong

Answer 3

Gạch là phần

Answer 4

Giúp mk

Answer 5

\(\dfrac{2}{7}+\dfrac{1}{9}+\dfrac{1}{7}+\dfrac{5}{9}+\dfrac{8}{14}\)

=\(\left(\dfrac{2}{7}+\dfrac{1}{7}\right)+\left(\dfrac{1}{9}+\dfrac{5}{9}\right)+\dfrac{8}{14}\)

=\(\dfrac{3}{7}+\dfrac{5}{9}+\dfrac{4}{7}\)

=