Calcule e simplifique as expressões numéricas.
A) (9/5 - 2/9) ÷ (1/8 + 1/5) . 2/3=
B) [3/4 . (2/1÷4/5-1/5)]
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A) (9/5 - 2/9) ÷ (1/8 + 1/5) . 2/3 = (9.9 - 5.2)/45 : (5 + 8)/40 . 2/3 = (81-10)/45 : 13/40 . 2/3 = 71/45 . 40/13 . 2/3 = 40/45 (:5)/(:5) . 71/13 . 2/3 = 8/9 . 71/13 . 2/3 = 1136/351 B) [3/4 . (2/1÷4/5-1/5)] = [3/4 . (2 . 5/4 - 1/5)] = [3/4 . (10/4 - 1/5)] = [3/4 . (5/2 - 1/5)] = [3/4 . ( 5.5 - 2)/10] = [3/4 . (25 - 2)/10] = [3/4 . 23/10] = 69/40
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