Bài $1$.
$f$) `1/3 - 3/4 - (-3/5) + 1/{64} - 2/9 - 1/{36} + 1/5`
`= 1/3 - 3/4 + 3/5 + 1/{64} - 2/9 - 1/{36} + 1/5`
`= (1/3 - 2/9) - (3/4 + 1/{36}) + (3/5 +1/5) + 1/{64}`
`= 1/9 - 7/9 + 4/5 + 1/{64}`
`= -2/3 + 4/5 + 1/{64}`
`= 2/15 + 1/{64}`
`= {143}/{960}`.
$g$) `(3 - 1/4 + 2/3) - ( 5-1/3-1/2) + (6 - 7/4 + 3/2)`
`= 3 - 1/4 + 2/3 - 5 + 1/3 + 1/2 + 6 - 7/4 + 3/2`
`= (3-5+6) - (1/4 + 7/4) + (2/3+1/3) + (1/2 + 3/2)`
`= 4 - 2 + 1 + 2`
`= 5`.
$h$) `{11}/{24} - 5/{41} + {13}/{24} + 0,5 - {36}/{41}`
`= ({11}/{24} + {13}/{24}) - (5/{41} + {36}/{41}) + 0,5`
`= 1 - 1 + 0,5`
`= 0,5 = 1/2`.
