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Sagot :

Bonjour

Calculer astucieusement :

A=(+12)+(-5) - (+8) + (-12)

A = 12 - 5 - 8 - 12

A = 12 - 12 - 5 - 8

A = - 13

B=(+4) - (+9)+(-10) - (-16)

B = 4 - 9 - 10 + 16

B = 4 + 16 - 9 - 10

B = 20 - 19

B = 1

C=(-5) + (+13) -(-5)+(-4)

C = - 5 + 13 + 5 - 4

C = - 5 + 5 + 13 - 4

C = 9

D=(+7)-(-3)+(-7) - (+5)

D = 7 + 3 - 7 - 5

D = 7 - 7 + 3 - 5

D = - 2.

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