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Sagot :

1
_
4
_
21
_
10
Et 5
_
42 voilà

-3/4 + 1/2

2/5 - 5/2

= -3/4 + 2/4

4/10 - 25/10

= -1/4

-21/10

= -1/4 × -10/21

= 5

42

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