Đáp án:
`a, 5 27/5 + 27/23 + 0,5 - 5/27 + 16/23`
`= 52/5 + 27/23 + 1/2 - 5/27 + 16/23`
`= (52/5 + 1/2 ) + ( 27/23 + 16/23) - 5/27`
`= 109/10 + 43/23 - 5/27`
`= 12,5843... ≈ 12,58`
`b, 25 . (-1/5)^2 + 1/5 - 2.(-1/2)^2 - 1/2`
`= 25 . 1/25 + 1/5 - 2.1/4 - 1/2`
`= 1 + 1/5 - 1/2 - 1/2`
`= 6/5 - 1 = 1/5`
`c, 35 1/6 : (-4/5) - 46 1/5 : (-4/5)`
`= (35 1/6 - 46 1/5 ) : (-4)/5`
`= -331/30 : (-4)/5 = 331/24`
`Go od luck!`