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Aya937
@Aya937
April 2019
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Exercice 1 : completer les egalités suivantes a)
exercice 1 : completer les egalités suivantes
a) (11-......)°=121-......+4/49 y °
b) ( 1/3 t +.....) (1/3 t - .....) = ....... - 81/25
c) (......+7) ° = 56z +........
exercice 2 : factoriser les expression suivantes
a) 3x°+9x4 b) 3(x+1)-(2x+7)(x+1)
c) x°+6x+9 d) 25x° - 10x+1
e) 49a° - 1 f) (5x - 2 )° - 16x°
g) (1-4x)° - (x-2x)° h) (x+1)(3-x) - (x+1)
° = au carré
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droopette
A) (11-2/7y)²=121-44/7y+4/49 y²
b) ( 1/3 t +9/5) (1/3 t - 9/5) = 1/9t²- 81/25
c) (4z+7)² =16z²+ 56z +49
exercice 2 : factoriser les expression suivantes
a) 3x²+9x+4=3x(x+3)+2²
b) 3(x+1)-(2x+7)(x+1)=(x+1)(3-x+1)=(x+1)(4-x)
c) x²+6x+9=(x+3)²
d) 25x² - 10x+1=(5x-1)²
e) 49a² - 1=(7a+1)(7a-1)
f) (5x - 2 )² - 16x²=(5x-2+4x)(5x-2-4x)=(9x-2)(x-2)
g) (1-4x)² - (x-2x)²=(1-4x-x+2x)(1-4x+x-2x)=(1-3x)(1-5x)
h) (x+1)(3-x) - (x+1)=(x+1)(3-x-1)=(x+1)(2-x)
2 votes
Thanks 1
aya937
le c) (28z+7)²=784z²+56z+49 c 'est le quelle le bon le tien ou celui la
droopette
(4z+7)² =16z²+ 56z +49 (28z+7)²=784z²+56z+49 les 2 sont justes, les énoncés ne sont pas pareils
droopette
(28z+7)²=784z²+56z+49 faux pardon, car ca fait :784z²+392z+49
aya937
ok mercii
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Aider moi SVP 1) Developper et reduire a) (5x+7)(1-3x)b) 4x(-x+3) - (2x+5) (x-1)c) (y+1/5) (y-1/5)(vous pouvez mettres tout les etapes svp)
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b) ( 1/3 t +9/5) (1/3 t - 9/5) = 1/9t²- 81/25
c) (4z+7)² =16z²+ 56z +49
exercice 2 : factoriser les expression suivantes
a) 3x²+9x+4=3x(x+3)+2²
b) 3(x+1)-(2x+7)(x+1)=(x+1)(3-x+1)=(x+1)(4-x)
c) x²+6x+9=(x+3)²
d) 25x² - 10x+1=(5x-1)²
e) 49a² - 1=(7a+1)(7a-1)
f) (5x - 2 )² - 16x²=(5x-2+4x)(5x-2-4x)=(9x-2)(x-2)
g) (1-4x)² - (x-2x)²=(1-4x-x+2x)(1-4x+x-2x)=(1-3x)(1-5x)
h) (x+1)(3-x) - (x+1)=(x+1)(3-x-1)=(x+1)(2-x)