\(=\dfrac{2}{9}+\dfrac{7}{9}+\dfrac{3}{7}+\dfrac{4}{7}-\dfrac{2}{13}=1+1+-\dfrac{2}{13}=2+\left(-\dfrac{2}{13}\right)=\dfrac{26}{13}+\left(-\dfrac{2}{13}\right)=\dfrac{24}{13}\)

1. bought

2. haven't planned

3. went

4. didn't finish

5. HAve - learnt

\(=\dfrac{4}{5}\times\left(\dfrac{3}{7}+\dfrac{6}{7}-\dfrac{4}{14}\right)=\dfrac{4}{5}\times\left(\dfrac{9}{7}-\dfrac{2}{7}\right)=\dfrac{4}{5}\times1=\dfrac{4}{5}\)

\(=\dfrac{3}{8}\times\dfrac{4}{9}+\dfrac{3}{8}\times\dfrac{5}{9}=\dfrac{3}{8}\times\left(\dfrac{4}{9}+\dfrac{5}{9}\right)=\dfrac{3}{8}\)

Telephone was invented by Alexander Gramham Bell in 1876.

= 146 x 28 + 54 x 146 +146 x 18

= 146 x (28 + 54 + 18)

= 146 x 100

= 14600

B

He was watching TV at home at this time yesterday.

My - yours

It's easy to do this exercise.