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Juliette155
@Juliette155
April 2019
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Réduire l'expressions:
A=3x+(2x-1)-(5x-4)
déveloper,rédduire,ordonner
B=3x(x-5)-2(3x+1)
déveloper,rédduire,ordonner
C=(3-2x)(3x-5)-(5x-1)(2-x)
en déduire le calcul mental de D pour x=341,75
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lesdevoirscnul
^=au carré A= 3x+(2x-1)-(5x-4) A= 3x+10x^+4 A=10x^+3x+4
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Thanks 1
hunterxpro4
A=3x+(2x-1)-(5x-4)
= 3x + 2x -1 - 5x +4
=5x - 5x -1 + 4
= -1 + 4
= 3
B=
3x(x-5)-2(3x+1)
= 3x²-15x -6x-2
= 3x² -21x - 2
C=(3-2x)(3x-5)-(5x-1)(2-x)
=9x-15-6x²+10x - ( 10x-5x² - 2 + x )
=19x - 15 -6x² - 10x + 5x² + 2 -x
=8x - 13 - x²
0 votes
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= 3x + 2x -1 - 5x +4
=5x - 5x -1 + 4
= -1 + 4
= 3
B= 3x(x-5)-2(3x+1)
= 3x²-15x -6x-2
= 3x² -21x - 2
C=(3-2x)(3x-5)-(5x-1)(2-x)
=9x-15-6x²+10x - ( 10x-5x² - 2 + x )
=19x - 15 -6x² - 10x + 5x² + 2 -x
=8x - 13 - x²