\(2\frac{1}{3}=\frac{7}{3};4\frac{2}{5}=\frac{22}{5};3\frac{1}{4}=\frac{13}{4};9\frac{5}{7}=\frac{68}{7};10\frac{3}{10}=\frac{103}{10}\)

1.B

2.E

3.D

4.C

5.A

\(\frac{81}{125}=\frac{3^4}{5^3}\)

\(-\frac{8}{27}=\left(-\frac{2}{3}\right)^3\)

1.The skis were too expensive for us to buy

Nhiều vậy, ít thôi.

\(\Leftrightarrow7B=1+\frac{1}{7}+\frac{1}{7^2}+...+\frac{1}{7^{99}}\)

\(\Leftrightarrow7B-B=1-\frac{1}{7^{100}}\)

\(\Leftrightarrow B=\frac{1-\frac{1}{7^{100}}}{6}\)

1.I alway go to school on time

2.My friend is Nga

3.My teacher goes to school by bike everyday

1.D

2.A

3.C

4.C

5.B

6.B