Réponse:
bon courage
Explications étape par étape:
A)
a) =7x-12-9+17-25
= -2x-12+17-25
=-2x-20
=
= -2(x+10)
b)
R = 11 au carré +7x-10-12×-3
= 11 au carré -5x-10-3
=11 au carré -5x-13
B)
c) = 5+(4-3x)-(7x+8)
= 5 +4-3x-(7x-8)
= 5+4-3-7x-8
= 1-3x-7x
= 1-10x
d) = (8x-15)+7(4x+1)
8x -15+7(4x+1)
= 8x-15+28x+7
= 36x-15+7
= 36x-8
c) 5(x-9)+4(x+6)
= 5x45+4(x-6)
= 5x-45+4x+24
= 9x-45+24
=9x-21
f) 3(2x-3)-5(4-2x)
= 6x-9-5(4-2x)
= 6x-9-20+10x
=16x-9-20
=16x-29
