Đáp án:
`a,`
`11 3/4 - (6 5/6 - 4 1/2) + 1 2/3`
`= 47/4 - (41/6 - 9/2) + 5/3`
`= 47/4 - 7/3 + 5/3`
`= 113/12 + 5/3`
`= 133/12`
`b,`
`2 17/20 - 1 11/15 + 6 9/20 ÷ 3`
`= 57/20 - 26/15 + 129/20 × 1/3`
`= 57/20 - 26/15 + 43/20`
`= 67/60 + 43/20`
`= 49/15`
`c,`
`4 3/7 ÷ (7/5 × 4 3/7)`
`= 31/7 ÷ (7/5 × 31/7)`
`= 31/7 ÷ 31/5`
`= 31/7 × 5/31`
`= 5/7`
`d,`
`(3 2/9 × 15/23 × 1 7/29) ÷ 5/23`
`= (29/9 × 15/23 × 36/29) × 23/5`
`= (145/69 × 36/29) × 23/5`
`= 60/23 × 23/5`
`= 12`
