a) 2 - 2/3 x 5/4 = 2 - 10/12 = 7/6
b) 4/7 : (5/7 - 3/14) = 4/7 x 2 = 8/7
`a) 2 - 2 / 3 xx 5 / 4`
`= 2 - 10 / 12`
`= 24 / 12 - 10 / 12`
`= 14 / 12 = 7 / 6`
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`b) 4 / 7 : ( 5 / 7 - 3 / 14 )`
`= 4 / 7 : ( 10 / 14 - 3 / 14 )`
`= 4 / 7 : 7 / 14`
`= 4 / 7 : 1 / 2`
`= 4 / 7 . 2`
`= 8 / 7`