a) `13/18 - 2/9 + 1/2`
`= 13/18 - 4/18 + 9/18`
`= (13-4+9)/18`
`=18/18`
`=1`
b) `3/4 xx 5/6 - 1/6`
`= 15/24 - 1/6`
`= 15/24 - 4/24`
`=11/24`
c) `4 8/5 - 2/3 xx 9/4`
`= 4 8/5 - 18/12`
`= 28/5 - 3/2`
`=56/10 - 15/10`
`=41/10`
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a) 1318−29+121318-29+12
=1318−418+918=1318-418+918
=13−4+918=13-4+918
=1818=1818
=1=1
b) 34×56−1634×56-16
=1524−16=1524-16
=1524−424=1524-424
=1124=1124
c) 485−23×94485-23×94
=485−1812=485-1812
=285−32=285-32
=5610−1510=5610-1510
=4110
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