Explicación paso a paso:
a = 2/5 b = -5/7
a + b = 2/5 + (-5/7) = [(7 x 2) + (5 x -5)] / 35
= (14 - 25)/35
= -11/35
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Explicación paso a paso:
a = 2/5 b = -5/7
a + b = 2/5 + (-5/7) = [(7 x 2) + (5 x -5)] / 35
= (14 - 25)/35
= -11/35