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Answer:
18 i) 23/63
ii) 91/24
Step-by-step explanation:
(18) (i) 5/63 - (-6/21)
= 5/63 + 6/21
= 5/63 + 18/63
= 23/63
(ii) (-7/12) ÷ (-2/13)
= (-7/12) × (13/-2)
= (-91/-24)
= ( 91/24)
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