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Question
Simplify:
\[\left( 4^{- 1} - 5^{- 1} \right) \div 3^{- 1}\]
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Solution
\[\left( 4^{- 1} - 5^{- 1} \right) \div 3^{- 1}\] `=(1/4-1/5)div1/3` → (a−1 = 1/a)
`=((5-4)/20)xx3`
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