Question

evaluate (8^-1-9^-1)^-1×(4^-1-9^-1)^-1​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

(8^-1-9^-1)^-1×(4^-1-9^-1)^-1

=( 1/8 - 1/9) ^-1 × (1/4-1/9)^-1

={(9-8)/72}^-1× {(9-4)/36}^-1

= (1/72)^-1×(5/36)^-1

= 72× 36/5

= 2592/5

= 518 2/5