January 2020 1 34 Report
Resolva as operaçoes com fraçoes,e apresente o resultado o mais simples possivel:

a) (1/4) ₊ (5/6)

b) (3/4) ₋ (4/9)

c) (7/4) · (8/6)

d) (3/5) : (9/10)
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