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b) 3/8 de 824 = 3/8 · 824 = 309
c) 4/5 de 90 = 4/5 · 90 = 72
d) 2/3 de 24 = 2/3 · 24 = 16
e) 3/4 de 56 = 3/4 · 56 = 42
f) 2 1/2 veces 15 = 5/2 · 15 = 75/2