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? asked in Science & MathematicsMathematics · 9 years ago

Need big help for Math Question, please?

1 / ((1/a)-(1/b)) is equal to

A. a-b

B. ab / b-a

C. b-a / ab

D. b-a

E. None of these.

5 Answers

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  • None
    Lv 7
    9 years ago
    Favorite Answer

    1/(1/a - 1/b) = 1/[(b - a)/ab] = ab/(b - a)

    Since none of the given answers A though D is correct, it must be E

    Note that ab/b - a = a - a = 0

    Try to remember and apply the rules for order of execution. Division precedes subtraction

  • Anonymous
    9 years ago

    On a high school math test, Chuck Norris put down "Violence" as every one of the answers. He got an A+ on the test because Chuck Norris solves all his problems with Violence.

    Source(s): http://4q.cc/index.php?pid=top100&person=chuck
  • Mike G
    Lv 7
    9 years ago

    1 / [(1/a)-(1/b)]=

    1[b/ab - a/ab]=

    1/[(b-a)/ab]=

    ab/(b-a)

    Answer B

  • Ralph
    9 years ago

    That's what she said!

  • Luca
    9 years ago

    B

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