`a)` `2/3 - 5/7 . 14/25`

`= 2/3 - 2/5`

`= 10/15 - 6/15`

`= 4/15`

`b)` `-8/13 . 3/4 + -8/13 . -5/6 - -8/13`

`= -8/13 . ( 3/4 + -5/6 - 1 )`          

`= -8/13 . -13/12`

`= 8/12`           

`= 2/3`

`c,` `25% - 1 1/2 + 0,5 . 12/5`

`=` `1/4 - 3/2 + 1/2 . 12/5`

`=` `-5/4 + 6/5`

`=` `-1/20`

`d,` `75% + 1,1 : ( 2/5 - 1 1/2 ) - ( 1/3 )^2`

`=` `3/4 + 1,1 : ( -11/10 ) - 1/9`

`=` `3/4 + ( -1 ) - 1/9`

`=` `-1/4 - 1/9`

`=` `-13.36`

$#Rin$

Đang lm thì cô bảo ktr đột xuất nên h mới gửi ặ :(

`a,` `2/3 - 5/7 . 14/25`

`=` `2/3 - 2/5`

`=` `4/15`


`b,` `-8/13 . 3/4 +` $\dfrac{-8}{3}$ `.` $\dfrac{-5}{6}$ `-` $\dfrac{-8}{13}$

`-8/13 . 3/4 +` $\dfrac{-8}{3}$ `.` $\dfrac{-5}{6}$ `-` $\dfrac{-8}{13}$ `. 1`

`=` `-8/13 . ( 3/4 - 5/6 - 1 )`

`=` `-8/13 .` $\dfrac{-13}{12}$

`=` `2/3`


`c,` `25% - 1 1/2 + 0,5 . 12/5`

`=` `1/4 - 3/2 + 1/2 . 12/5`

`=` `-5/4 + 6/5`

`=` `-1/20`


`d,` `75% + 1,1 : ( 2/5 - 1 1/2 ) - ( 1/3 )^2`

`=` `3/4 + 1,1 : ( -11/10 ) - 1/9`

`=` `3/4 + ( -1 ) - 1/9`

`=` `-1/4 - 1/9`

`=` `-13.36`


`@` $Cyan$

~ Chúc bạn học tốt nhé ~