Question

(a^-1-b^-1)^-1=ab÷a+b​

Answer 1

Hey mates your answer is here

1/a + 1/b = (1b)/ab + (1a)/ab = (a+b)/ab. Then note that 1/(x/y) = (x/y)-1 = y/x, so you only need to switch the numerator and denominator to get your ...

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