Question

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a)
3/4 + 1/5 - 7

Answer 1

a) Calcule o mmc((4,5) = 20

b) Efetue:

$\frac{3}{4}+\frac{1}{5}-7=\frac{15+4-140}{20}=-\frac{121}{20}$

Answer 2

a)  3  + 1  - 7
      4      5

15  +  4  -  7  =
        20

- 121 
    20