( VALENDO 100 PONTOS !!!!!!! )
Determine o resultado das expressões numéricas a seguir. Apresente as respostas na forma de frações irredutíveis.
a) 5/7 + 1/6 + 1/21
b) 5 - 1/2 + 5/3
c) 3 1/5 - 2/3 + 2 1/3
d) 1/2 + 1/3 + 5/6
e) 3/4 + 5/6 - 1/2
f) 5/6 - 1/2 - 1/3
g) 1/2 - 1/3 + 5/6 - 3/4​
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