developper puis reduire....a=3(x-2)+5(3-x)....b=x(3+x)-2(x+5)....c=-2(x-7)-2(x²+x)+4(x²+1)....d=2x(-x+5)-x²(1-x)....e=-6x(2x²-3x)-3(x+4x²)-x(-3+4x)...merci
Mathématiques
mananoutcha
Question
developper puis reduire....a=3(x-2)+5(3-x)....b=x(3+x)-2(x+5)....c=-2(x-7)-2(x²+x)+4(x²+1)....d=2x(-x+5)-x²(1-x)....e=-6x(2x²-3x)-3(x+4x²)-x(-3+4x)...merci
2 Réponse
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1. Réponse Anonyme
Bonjour,
a = 3(x - 2) + 5(3 - x)
= 3x - 6 + 15 - 5x
= -2x + 9
b = x(3 + x) - 2(x + 5)
= 3x + x² - 2x - 10
= x² + x - 10
c = -2(x - 7) - 2(x² + x) + 4(x² + 1)
= -2x + 14 - 2x² - 2x + 4x² + 4
= 2x² - 4x + 18
d = 2x(-x + 5) - x²(1 - x)
= -2x² + 10x - x² + x^3
= x^3 - 3x² + 10x
e = -6x(2x² - 3x) - 3(x + 4x²) - x(-3 + 4x)
= -12x^3 + 18x² - 3x - 12x² + 3x - 4x²
= -12x^3 + 2x² -
2. Réponse caro67000
A = 3(x - 2) + 5(3 - x) =
3x - 6 + 15 - 5x =
-2 x + 9
B = x(3 + x) - 2(x + 5) =
3x + x² - 2x - 10 =
x² + x - 10
C = -2(x - 7) - 2(x² + x) + 4(x² + 1)
-2x + 14 - 2x² - 2x + 4x² + 4 =
2 x² - 4x + 18
D = 2x(-x + 5) - x²(1 - x) =
-2x² + 10x - x² + x^3 =
x^3 - 3 x² + 10x
E = -6x(2x² - 3x) - 3(x + 4x²) - x(-3 + 4x)=
-12x^3 + 18x² - 3x - 12x² + 3x - 4x²=
-12 x^3 + 2x²