Sagot :
bonjour
a = 3 x + 15 + 7 = 3 x + 22
b = - 2 + 8 x - 7 - 14 x = - 6 x - 9
c = 3 x /2 + 4 - x = 3 x /2 - 2 x /2 + 8/2 = x /2+ 4
d = - x - 3 + 2 x - 8 = x - 11
( 2 - x ) ( 3 x + 7 ) = 6 x + 14 - 3 x² - 7 x = - 3 x² - x + 14
Bonjour,
a) 3(x+5)+7 = 3*x + 3*5 + 7
= 3*x + 15 +7
= 3*x + 22
b) -2+3x+5x+7-14x = -2 + 7 + 3x + 5x - 14x
= 5 + 8x - 14x
= 5 - 6x
= -6x + 5
c) 3/2x+4-x = 3/2x - x + 4
= 1/2x + 4
d) -(x+3)+2x-8 = -x - 3 + 2x - 8
= -x + 2x - 3 - 8
= x - 11
e) (2-x)(3x+7) = 2*3x + 2*7 - x*3x - 7*x
=6x + 14 - 3x^2 - 7x
=-3x^2 + 6x - 7x + 14
= -3x^2 - x + 14
a) 3(x+5)+7 = 3*x + 3*5 + 7
= 3*x + 15 +7
= 3*x + 22
b) -2+3x+5x+7-14x = -2 + 7 + 3x + 5x - 14x
= 5 + 8x - 14x
= 5 - 6x
= -6x + 5
c) 3/2x+4-x = 3/2x - x + 4
= 1/2x + 4
d) -(x+3)+2x-8 = -x - 3 + 2x - 8
= -x + 2x - 3 - 8
= x - 11
e) (2-x)(3x+7) = 2*3x + 2*7 - x*3x - 7*x
=6x + 14 - 3x^2 - 7x
=-3x^2 + 6x - 7x + 14
= -3x^2 - x + 14