(ii) [(4)^-1 - (5)^-1]^2 x (5/8)^-1
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(4^-1 + 5^-1)^2 X (5/8)^-1
(1/4+1/5)^2 X 8/5
(5+4/20) X 8/5 [doing lcm]
9/20 X 8/5
18/25
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