Réponses

2014-05-11T10:44:38+02:00
A) 2(x+3)+5
= 2*x +2*3 +5
= 2x +6 +5
= 2x +11

b) 13+5(3-x)
= 13 +5*3 -5*x
= 13 +15 -5x
= 28 -5x

c) 7y +9(y-2)
= 7y +9*y -9*2
= 7y +9y -18
= 16y -18

d) 6(a+1) + (3+a)
= 6*a +6*1 +6*3 +6*a
= 6a +6 +18 +6a
= 12a +24
2014-05-11T10:48:11+02:00

a) 2x(x+3)+5

2x3x+5

10+3x


b)13+5x(3-x)

13+5x(-3x)

18x(-3x)

c)7y+9(y-2)

5y au carré +9


d)6+(a+1)+(3+a)

6+1a+3a

4a+6