Aidez-moi svp; I) Développer, réduire, ordonner:

1) 3x(x+2)-8(3x-6)
2) (8x+5)(8x-5)
3) 6(8x-2)+3(7+2x)

x ≠ multiplié

II) Calculer les expressions littérales suivantes pour:

a. a=5; b=9; c=1
b. a=4; b=4; c=2
c. a= ; b=3; c=1

1) ab+bc-ca
2) c(a+b)
3) ab+c(a-b)
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