{exercices pour 20 pts!!} ex 17,18. + ex 76.... Pergunta de ideia deAminekiller

April 2019 1 84 Report

{exercices pour 20 pts!!}
ex 17,18. + ex 76

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youssra95 Exercice17
a)2a+7=1 b) -4 = 6+5x c)5-x=8
2a+7-7=1-7 -4-6 = 6-6+5x 5-5-x=8-5
2a=-6 -10 = 5x -1x=3
2/2a=(-6)/2 (-10)/5 = 5/5x -1/-1x=3/-1
a =-3 x=-2 x=-3

exercice18

a)5x-8=3x b)4x=3-2x c)x=4x-6
5x-5x-8=3x-5x 4x+2x=3-2x+2x x-4x=4x-4x-6
-8= -8x 6x=3 -3x=-6
-8/-8= -8/-8x 6/6x=3/6 -3/-3x=-6/-3
x=1 x=0.5 x=2

exercice 76
a) G=(3x+2)²-(3x+2)(x+7)
= (3x²+2X3xX2+2²)-(3x+2)(x+7)
=9x²+12x+4-(3x+2)(x+7)
=9x²+12x+4-(3x²+3xX7+2Xx+2X7)
=9x²+12x+4-(3x²+21x+2x+1)
=9x²+12x+4- (3x²+23x+1)
=9x²+12x+4+(-3x²)-23x-1
G =6x²-11x+3

b)G =6x²-11x+3

1 votes Thanks 1

youssra95 derien par contre j'ai pas reussi a factoriser pour l'exercice 76 et donc jai pas fini l'exo