Step-by-step explanation:
(-8) ^-1+(5^-1-4^-1) -1 = 1/-8 (1/5 - 1/4) - 1
= - 1/8 (4/20 - 5/20) - 1
= - 1/8 - 1/20 - 1
= - 5/40 - 2/40 - 40/40
= -47/40
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Step-by-step explanation:
(-8) ^-1+(5^-1-4^-1) -1 = 1/-8 (1/5 - 1/4) - 1
= - 1/8 (4/20 - 5/20) - 1
= - 1/8 - 1/20 - 1
= - 5/40 - 2/40 - 40/40
= -47/40