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Sagot :

SAMMED
exercice 2:
 3) (x+y)² - (x-y)²=(x+y)²-[(x-y)(x+y)]²
                        =(x+y)²- (x-y)²(x+y)²
                        =(x+y)² [1-(x-y)²]


4) 10001²-9999²= (10001-9999)(10001+9999)
                      = 2*20000=40000

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