Question

O valor da expressão
$\frac{a + b}{1 - ab}$
Para a =
$\frac{1}{2}$
E b=
$\frac{1}{3}$
É:

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Answer 1

a = 1/2

b = 1/3

(a + b) / (1 - a . b)

(1/2 + 1/3) / (1 - 1/2 . 1/3)

((2 + 3) / 6) / (1 - 1/6)

(5/6) / (6/6 - 1/6)

(5/6) / (5/6)

5/6 . 6/5

30/30

1