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Sagot :

A=(+5)-(-6)x(-3)
A= (+5)-(+18)
A= -13

B= (-7):((9)+(-21)-(-3)
B=(-7):(+7) -(-3)
B= (-1)-(-3)
B= 2

C=((-3)+(-11))x((-3)-(-7))
C=(-14)x(+4)
C= -56

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