Calcule o valor das seguintes expressões, simplificando o resultado quando possível: a)21/4+5/4

b)5-4/3+21/6

c)2/3:4/5+1/2

d)(21/4-3/8).(5/12+1/4)

e)[9/25:27/25]:1/6

f)3.9/4-{[4/9+2]:2/3}
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