Đáp án:
Giải thích các bước giải:
Bài 1:
a) `-5/7 - (-5/67) + 13/30 + 1/2 + (-1 5/6) + 1 3/14 - (-2/5)`
`= -5/7 + 5/67 + 13/30 + 1/2 - 11/6 + 17/14 + 2/5`
`= (-5/7 + 1/2 + 17/14) + (13/30 - 11/6 + 2/5) + 5/67`
`= (-10/14 + 7/14 + 17/14) + (13/30 - 55/30 + 12/30) + 5/67`
`= 1 + (-1) + 5/67`
`= 0 + 5/67`
`= 5/67`
Bài 3:
`C = [(2/193 - 3/386) . 193/17 + 33/34] ÷ [(7/2001 + 11/4002) . 2001/25 + 9/2]`
`C = [(4/386 - 3/386) . 193/17 + 33/34] ÷ [(14/4002 + 11/4002) . 2001/25 + 9/2]`
`C = (1/386 . 193/17 + 33/34) ÷ (25/4002 . 2001/25 + 9/2)`
`C = (1/34 + 33/34) ÷ (1/2 + 9/2)`
`C = 1 ÷ 5`
`C = 1/5`
Vậy `C = 1/5`
Học tốt. Nocopy
