1. Efetue as adições algébricas dos números racionais.
a) 2/3 + 1/2 - 3/8
b) 5 + 3/4
c) - 4/5 - 3/4 + 1/6 8 1/4 + 1/6 + 3/8
e) 0, 2 + 4/5​
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