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Sagot :

PAMC

Bonsoir,

identité remarquable: a²-b²=(a+b)(a-b)

a. 121x²-4=11²x²-2²=(11x-2)(11x+2)

b. 16x²-49=4²x²-7²=(4x-7)(4x+7)

c. 4x²-5x=x(4x-5)

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