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Rits
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April 2019
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MATHS 3ÈME,PUISSANCES,SVP DE L'AIDE!!
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N°116
(-3/4)^(-7)=-(3/4)^(-7)=-(4/3)^7
n°117
S=2^0+2^1+...+2^50
pour tout entier n, 2^(n+1)-2^n=2*2^n-2^n=(2-1)*2^n=2^n
donc S=(2^1-2^0)+(2^2-2^1)+...+(2^51-2^50)
donc S=2^51-1
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(-3/4)^(-7)=-(3/4)^(-7)=-(4/3)^7
n°117
S=2^0+2^1+...+2^50
pour tout entier n, 2^(n+1)-2^n=2*2^n-2^n=(2-1)*2^n=2^n
donc S=(2^1-2^0)+(2^2-2^1)+...+(2^51-2^50)
donc S=2^51-1