Bài 2: (1,5 điểm). Thực hiện phép tính: a) $\frac{3}{4}$ + $\frac{5}{8}$ - $\frac{7}{6}$ b) $\frac{-23}{7}$.$\frac{3}{10}$ + $\frac{13}{7}$.$\frac{3}{10}$ c) $(\frac{-5}{6})^{6}$.$(\frac{6}{5})^{8}$

Tham khảo :

`a . ` `3/4+5/8-7/6`

`=` `18/24+15/24-28/24`

`=` `(18+15-28)/24`

`=` `5/24`

`- - - - - - - - - - - `

`b . ` `(-23)/7*3/10+13/7*3/10`

`=` `3/10*((-23)/7+13/7)`

`=` `3/10*(-10/7)`

`=` `-3/7`

`- - - - - - - - - - - `

`c . ` `((-5)/6)^6*(6/5)^8`

`=` `15625/46656*(6^8)/(5^8)`

`=` `(5^6)/(6^6)*(6^6)/(5^8)`

`=` `(6^2)/(5^2)`

`=` `36/25`