Đáp án:
Giải thích các bước giải:
7) `(4 5/37 - 3 4/5 + 8 15/29) - (3 5/37 - 6 14/29)`
`= 4 5/37 - 3 4/5 + 8 15/29 - 3 5/37 + 6 14/29`
`= (4 5/37 - 3 5/37) + (8 15/29 + 6 14/29) + 3 4/5`
`= 1 + 15 - 19/5`
`= 16 - 19/5 = 80/5 - 19/5 = 61/5`
8) `-3,2 . -15/64 + (0,8 - 2 4/5) : 3 2/3`
`= -16/5 . -15/64 + (4/5 - 14/5) : 11/3`
`= 3/4 - 2 . 3/11`
`= 3/4 - 6/11 = 9/44`
9) `5 1/3 . 4,5 - 3 1/6 : 0,5 + 25% : 1 1/4`
`= 16/5 . 9/2 - 19/6 : 1/2 + 1/4 : 5/4`
`= 16/5 . 9/2 - 19/6 . 2 + 1/4 . 4/5`
`= 72/5 - 19/3 + 1/5`
`= 124/15`
6) `5/7 . 5/11 - 2/7 . 5/11 + 14/11 . 5/7`
`= 5/7 . 5/11 - 2/11 . 5/7 + 14/11 . 5/7`
`= 5/7 . (5/11 - 2/11 + 14/11)`
`= 5/7 . 17/11 = 85/77`
Học tốt. Nocopy.
