2.efetue a subtraçao.
a)(+2/5)-(+1/4)
b)(-5/8)-(+3/8)
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A) (+2/5) . 4 = (+8/20)
(+1/4) . 5 = (+5/20)
(+8/20 - (+5/20) = (+3/20)
B) (-5/8) - (+3/8) = (-2/8)
(+1/4) . 5 = (+5/20)
(+8/20 - (+5/20) = (+3/20)
B) (-5/8) - (+3/8) = (-2/8)
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