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Sagot :

A=4*(0,5^(x+1)-0,5^(x+2))=4*(0,5^(x+1)-0,5^(x+1)*0.5)
=4*0,5^(x+1)*(1-0,5)=4*0,5^(x+1)*0,5
=2*0,5^(x+1)

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