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Sagot :

Bonjour,

1) (7-3+7)-(7-3+7)+2

= 7-3+7-7+3-7+2

= 2

2) -5-(-5+5)-5+(+5)

= -5+5-5-5+5

= -5

3) -(7+8-9)+4-3+(-8+1+3-4)

= -7-8+9+4-3-8+1+3-4

= -13

4) +2-(9-3)-(-9+3+1)-(8+2-4-5)

= 2-9+3+9-3-1-8-2+4+5

= 0

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