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Sagot :

1)

(x+2)² - x²

= 2(2x+2)

= 4(x+1)

= 4x + 4

 

2)

4x+4 = 26

4x = 22

x = 22/4

x = 5,5 cm

 

En espérant t'avoir aidé.

 

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