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Sagot :

Bonjour,

A=15+(7-b)-9-(a-17)
A=15+7-b-9-a+17
A=30-b-a

B=(2x+1)(-4x+3)+4(2x-7)
B=-4x*2x+3*2x-4x*1+1*3+4*2x-7*4
B=-8x^2+6x-4x+3+8x-28
B=-8x^2+10x-25

C=-3(-2x-1)+6(3-x)
C=-3*-2x-1*-3+6*3-6*x
C=6x+3+18-6x
C=21

Bonne journée.

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