\(\frac{1}{8}\times\frac{3}{7}-\frac{1}{9}\times\frac{3}{7}\)

\(=\left(\frac{1}{8}-\frac{1}{9}\right)\times\frac{3}{7}\)

\(=\frac{1}{72}\times\frac{3}{7}\)

\(=\frac{1}{168}\)

k cho mik nha

1. A. improve B. cavity C. drill D. disease

2. A. started B. filled C. visited D. needed

3. A. hour B. house C. hot D. healthy

4. A. asked B. stopped C. called D. watched

5. A. measure B. serious

C. poster D. harvest

6. A. absent B. disease

C. poster D. essay

7. A. usually B. unhappy

C. uniform D. useful

8. A. armchair B. kitchen

C. catch D. chemistry

9. A. distance B. family

C. different D. library

10.A. which B. whole C. where D. what