Bài 1 (2,5 điểm): Thực hiện phép tính. a) A = $\frac{7}{12}$ - $\frac{3}{4}$.$\frac{5}{6}$ b) B = (-6)².($\frac{3}{4}$ - 0,25) - |-3| c) C = ($\frac{4}{5}$ + $\frac{-2}{3}$).$\frac{2023}{11}$ + ($\frac{1}{5}$ + $\frac{-1}{3}$).$\frac{2023}{11}$

`Accnswer`

`a)A=7/12-3/4 . 5/6`

`=7/12-5/8`

`=-1/24`

Vậy `A=-1/24`

`b)(-6)^2 . (3/4-0,24)-|-3|`

`=36. 1/2 -3`

`=18-3`

`=15`

Vậy `B=15`

`c)(4/5+(-2)/3). 2023/11+(1/5+(-1)/3). 2023/11`

`=[(4/5+1/5)+(-2/3-1/3)]. 2023/11`

`=(1-1).2023/11`

`=0.2023.11`

`=0`

Vậy `C=0`