Câu 7. (1,0 điểm) a) Tính: $\frac{-3}{11}$.$\frac{3}{13}$ + $\frac{-3}{11}$ : $\frac{13}{10}$ b) Tìm x, biết: $\frac{1}{6}$x - $\frac{5}{3}$ = $\frac{1}{2}$

`a . ` `(-3)/11*3/13+(-3)/11:13/10`

`=` `(-3)/11*3/13+(-3)/11*10/13`

`=` `(-3)/11*(3/11+10/13)`

`=` `(-3)/11*1`

`=` `-3/11`

$\\$

`b . ` `1/6x-5/3=1/2`

`=>` `1/6x=1/2+5/3`

`=>` `1/6x=13/6`

`=>` `x=13`

Vậy `x=13`

`#me`