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Kenza1504
@Kenza1504
April 2019
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Bonjour , je ne comprends pas mon exo :
1) développer et réduire chacune des expressions suivantes .
A= (4x-6)(8+3x)
B= 3(2x-7)-(2x-8)(-2x+5)
C=(2x+5)²
voila merci d'avance :)
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nonotata
A= (4x-6)(8+3x)
a = 24x+12x²-48-18x
a =12x²+6x-48
B= 3(2x-7)-(2x-8)(-2x+5)
b = 6x-21 -(-4x²+10x+16x-40)
b = 6x-21+4x² -26x+40
b = 4x²-20x+19
C=(2x+5)²
c = 4x²-20x+25
0 votes
Thanks 0
kenza1504
merci :)
kirito57
Bonjour alors voilà les réponses, si tu ne comprends pas poses moi une question et je ferais de mon mieux pour t'expliquer:
A=(4x-6)(8+3x)
A=4x X 8+ 4x X 3x -6 X 8- 6 X 3x
A= 32x + 12x² - 48 - 18x
A= 12x²+ 32x -18x-48
A= 12x² + 14x -48
0 votes
Thanks 0
kenza1504
merci :)
kenza1504
2) il faut calculer l'expression b de la question 1 pour x= 10 si sa te dérange pas :)
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a = 24x+12x²-48-18x
a =12x²+6x-48
B= 3(2x-7)-(2x-8)(-2x+5)
b = 6x-21 -(-4x²+10x+16x-40)
b = 6x-21+4x² -26x+40
b = 4x²-20x+19
C=(2x+5)²
c = 4x²-20x+25
A=(4x-6)(8+3x)
A=4x X 8+ 4x X 3x -6 X 8- 6 X 3x
A= 32x + 12x² - 48 - 18x
A= 12x²+ 32x -18x-48
A= 12x² + 14x -48