Se M = a + [tex] \frac{b - a}{1 + ab}[/tex] e N = 1 - [tex] \frac{ab - a^{2} }{1 + ab} [/tex], com ab ≠ -1, então [tex] \frac{M}{N} [/tex] é:
a) a
b) b
c) 1 + ab
d) a - b
e) a + b
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