I just need help with a question on my math worksheet

Algebra
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1/R=1/a+1/b solve for R

May 5th, 2015

1/R = 1/a + 1/b                             write the fractions with the common denominator ab and add them

1/R = b/ab + a/ab = (a + b)/ab      take the reciprocal of both parts

R = (ab)/(a + b)           

May 5th, 2015

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