December 2019 1 64 Report
Determine o valor das expressões numéricas

a) (2/5 + 1/5) : (1/4 + 2/4)=

b)(1/1 - 1/4) : (2/5 - 1/10)=

c)(2/7 x 1/4) : (3/4 - 1/5)=
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