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Sagot :

3j(au carre)+3*2*7+7(au carre)

6+42+49

 

 

(3i+7)² -(i+5)²

a² - b² = (a-b)(a+b)

(3i+7 -i-5)(3i+7+i+5)

= (2i +2)(4i + 12)

= 8(i+1)(i+3)

 

En espérant t'avoir aidé.

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