Calcule os valores racionais de:
a) 2/5 - 1/6 + 1/2
b) 1 - 0,1
c)2/5 - 1/4 - 1/10
d) 1 + 2/5 - 3 tudo sobre 2 - 1/7
a) 2/5 - 1/6 + 1/2
b) 1 - 0,1
c)2/5 - 1/4 - 1/10
d) 1 + 2/5 - 3 tudo sobre 2 - 1/7
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b) 0,9
c) 1/20
d) -56/65