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Sagot :

LEMERCIERMATHIS6

Réponse:

1 a x+5=12

x=12-5=7

b x+8=3

x=3-8=-5

c x-7=5

x=5+7=12

d x-2=-9

x=-9+2=-7

2 a x + 3,4 = 7,8

x = 7,8 - 3,4= 4.4

b x + 6,9 = 3,7

x = 3,7 - 6,9=-3.2

c x-2,4 = 8,3

x= 8,3 + 2,4=10.7

d x-4,8 = -11,6

x = -11,6 + 4,8=-6.8

3 a 5 y = 35

y = 35 / 5 = 5

b 4 y = 32

y 32 / 4 = 8

c -3 y = 36

y = -36 / =-12

d -7 y =-63

y= -63/-7=9

4 a 3 x + 6 = 15

3 x = 15 - 6

3 x = 9

x = 9 / 3 = 3

b 4 x - 11 = 5

4 x = 5 + 11

4 x = 16

x = 16 / 4= 4

c 2 x + 3 = 19

2 x = 19 - 3

2x = 16

x = 16 / 2 = 8

d 5 x-8 = 38

5 x = 38 + 8

5 x = 46

x = 46 / 5

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