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Sagot :

salut,
1. (-7)-2-(-8) = -1
2. (-7)+2-(-8) = 3
3. (-7)-2+(-8) = -17

A= -7- (2)-(-8)

A= -7-2+8

A= -9+8

A= -1

B= -7+2-(-8)

B= -7+2+8

B= -7+10

B=3

C= -7-2+(-8)

C= -9-8

C= -17

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