Express as rational number's
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(5^-1-3^-1)^-1
(1/5-1/3)^-1. a^-1=1/a
(3/15-5/15)^-1
(-2/15)^-1. (a/b)^-1=b/a
-15/2 is the answer
(3/17)^-1 x (17/4)^-1. (a/b)^-1=b/a
17/3 x 4/17
4/3 is the answer
(-9)^-1 x(1/9)^-1 a^-1=1/a. (a/b)^-1
1/9 x 9
1 is the answer
(1/5-1/3)^-1. a^-1=1/a
(3/15-5/15)^-1
(-2/15)^-1. (a/b)^-1=b/a
-15/2 is the answer
(3/17)^-1 x (17/4)^-1. (a/b)^-1=b/a
17/3 x 4/17
4/3 is the answer
(-9)^-1 x(1/9)^-1 a^-1=1/a. (a/b)^-1
1/9 x 9
1 is the answer
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