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Sagot :

Réponse:

A=2+3(5×-1)-(7×-2)

=2+15×-3-7×+2

=15×-7×+2-3+2

[=8×+1]

B=4×(3-×)-5(2×+1)

=12×-4ײ-10×-5

[=-4ײ+2×-5]

C=(2×-9)(9+5×)-(10ײ+3×-4)

=18×+10ײ-81-45×-10ײ-3×+4

=10ײ-10ײ+18×-45×-3×-81+4

=18×-48×-77

[=-30×-77]

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