Bonjour pouvez vous m'aider a résoudre ces équations s'il vous plait il est a rendre pour mardi:

1) a) 37+x=15

b)-6/5=y-11/5

c)13-a=-52

d)7/2=-b-5/4

2)a) 4x=36

b) 3y=-21

c) 18=-4a

d) 4/5 m = 2/3

3)a) 6x=-27

b)-15=-20y

c)-2/3 t = -3/2

d) 1 + 2/3= -4a

merci d'avance .

2

Réponses

Meilleure réponse !
2014-06-07T13:15:01+02:00
Bonjour

1) a) 37+x=15
x = 15 -37
x = - 22

b)-6/5=y-11/5
-6/5 +11/5 = 5y/5
5 = 5y
y =1

c)13-a=-52
13 +52 = a
65 = a
a =65

d)7/2=-b-5/4
14/4 = - 4b - 5/4
14/4 + 5/4 = - 4b/4
19 = - 4b
b = - 19/4

2)a) 4x=36
x= 9

b) 3y=-21
y = -7

c) 18=-4a
- a = - 18/4
a = 9/2

d) 4/5 m = 2/3
12m/15 = 10/15
12m = 10
m = 10/12 = 5/6

3)a) 6x=-27
x = - 27/6

b)-15=-20y
y = 15/20 = 3/4

c)-2/3 t = -3/2
- 4t/6 = - 9/6
-4t = -9
t = 9/4

d) 1 + 2/3= -4a
3/3 + 2/3 = - 12a/3
5 = -12a
a = - 5/12



2014-06-07T13:33:22+02:00
37+x=15⇒x=15-37⇒x=-22
-6/5=y-11/5⇒11/5-6/5=y⇒y=5/5⇒y=1
13-a=-52⇒-a=-52-13⇒-a=-65⇒a=65
7/2=-b-5/4⇒7/2+5/4=-b⇒14/4+5/4=-b⇒19/4=-b⇒b=-19/4
4x=36⇒x=36/4⇒x=9
3y=-21⇒y=-21/3⇒y=-7
18=-4a⇒18/-4=a⇒a=-9/2
4/5 m=2/3⇒m=2/3 / 4/5⇒m=2/3*5/4⇒m=10/12⇒m=5/6
6x=-27⇒x=-27/6⇒x=-9/2
-15=-20y⇒-15/-20=y⇒y=-3/-4⇒y=3/4
-2/3 t=-3/2⇒t=-3/2 / -2/3⇒t=-3/2*-3/2⇒t=9/4
1+2/3=-4a⇒3/3+2/3=-4a⇒5/3=-4a⇒a=5/3/-4⇒a=-5/12
der1 frer