1.

Find (i) `7/24-17/36` (ii) `5/63-((-6)/21)` (iii) `(-6)/13-7/11` (v) `-2/9 -6`

Answer» (i)`7/24 -17/36 = (7**3)/(24**3) - (17**2)/(36**2)`
`=21/72 - 34/72 = (21-34)/72 = -13/72`

(ii)`5/63 - (-6/21) = 5/63+6/21 = (5+6**3)/63 `
`(5+18)/63 = 23/63`

(iii) `-6/13 -7/11 = (-6**11-7**13)/143`
`(-66-91)/143 = -157/143`

(iv)`(-2) 1/9 - 6 = -19/9 - 6 = (-19-6**9)/6`
`(-19-54)/6 = -73/6`


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