Bài 1: (2,0 điểm) Thực hiện phép tính: a) $\frac{1}{4}$ - $\frac{5}{6}$ + $\frac{7}{12}$ b) 6$\frac{2}{7}$.$\frac{1}{5}$ - 1$\frac{2}{7}$.$\frac{1}{5}$ + $\frac{4}{5}$ c) 4 + ($\frac{2}{3}$ + 5 - $\frac{2023}{\sqrt{2024²}}$) - (6 + $\frac{1}{2024}$ - $\frac{4}{3}$)

Đáp án+Giải thích các bước giải:

 `a)1/4-5/6+7/12=3/12-10/12+7/12=-7/12+7/12=0/12=0`

`b)6 2/7. 1/5-1 2/7. 1/5+4/5`

`=1/5.[6+2/7-(1+2/7)]+4/5`

`=1/5.(6-1+2/7-2/7)+4/5`

`=1/5. 5+4/5`

`=1+4/5`

`=5/5+4/5`

`=9/5`

`c)4+(2/3+5-\frac{2023}{\sqrt{2024^{2}}})-(6+\frac{1}{2024}-4/3)`

`=4+2/3+5-\frac{2023}{2024}-6-\frac{1}{2024}+4/3`

`=(4+5-6)+(2/3+4/3)-(\frac{2023}{2024}+\frac{1}{2024})`

`=3+6/3-\frac{2024}{2024}`

`=3+2-1`

`=3+1`

`=4`