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Coco108
@Coco108
April 2019
1
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Bonsoir tout le monde
j'ai des exos sur le calcul littéral
Il faut factoriser et réduire ces expressions:
J= (2x +3)au carré -49
K=25-(3x -1)au carré
L=(2 + x ) au carré - (4x +5) au carré
Merci d'avance répondez svp!!!!
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mohayati2006
J= (2x +3)²-7²
=(2X+3-7)(2X+3+7)
=(2X-4)(2X+10)
=2(X-2)2(X+5)
=4(X-2)(X+5)
K=25²-(3x -1)²
=(5-(3X-1)) (5+(3X-1))
(5-3X+1)(5+3X-1)
=(6-3X)(4+3X)
L=(2 + x )² - (4x +5)²
=(2+X-(4X+5)) (2+X+4X+5)
=(-3-3X)(5X+7)
=3(-1-X) (5X+7)
bonne courage
ses exercices pour prendre a²-b²=(a-b)(a+b) par cœur
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bonjour,je dois trouver : la masse du soleil est environ 300000 fois plus grande que celle de la terre ? la tere est d'environ 6x10exposant 21 tonnesla terre est d'environ 2x10 exposant 27 tonnesmerci
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=(2X+3-7)(2X+3+7)
=(2X-4)(2X+10)
=2(X-2)2(X+5)
=4(X-2)(X+5)
K=25²-(3x -1)²
=(5-(3X-1)) (5+(3X-1))
(5-3X+1)(5+3X-1)
=(6-3X)(4+3X)
L=(2 + x )² - (4x +5)²
=(2+X-(4X+5)) (2+X+4X+5)
=(-3-3X)(5X+7)
=3(-1-X) (5X+7)
bonne courage
ses exercices pour prendre a²-b²=(a-b)(a+b) par cœur