Réponses

2014-02-17T16:33:48+01:00
A) 2a-(-7+3b-c)
2a+7-3b+c
2a-3b+c+7

b) -5+(-3x²+x)
-5-3x²+x
-3x²+x-5

c) y+(-3z+x-2)
y-3z+x-2
x+y-3z-2

d) -b-(5a² -a+8)
-b-5a²+a-8
-5a²+a-b-8

2014-02-17T16:35:03+01:00
A) 2a - (-7 + 3b -c)
= 2a + 7 - 3b + c

b) -5 + (-3x² + x)
= -5 - 3x² + x

c) y + (-3z + x - 2)
= y - 3z + x - 2

d) -b - (5a² - a + 8)
= -b - 5a² + a - 8