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Sagot :

Bonsoir,

a)

3x+2 +x +3 + 2x+1

= 6x +6

b)

6x+6 = 18

6x = 18 -6

6x = 12

x= 12/6

x= 2

c)

BA = 3x+2 = 8

AC =  x+3 = 5

BC = 2x+1 = 5

BC = AC

=> c'est un triangle isocèle

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