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olga943
@olga943
July 2022
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7*3^11+7 доказать что выражение кратно 28
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oganesbagoyan
Verified answer
7*3¹¹ +7 =7*(3¹¹+1) =7*(3¹¹+1¹¹) =7*(3+1)* A =28A ;
A =3¹⁰-3⁹*1 +3⁸*1² -3⁷*1³ + ... +3²*1⁸ -3*1⁹+ 1¹⁰.
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iliili
(3^1+3^0)=3+1=4.7*3^11+7=7*(3^11+1)=7*(3^10(3^1+3^0))=7*3^10*4=7*4*3^10=28*3^10.
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Answers & Comments
Verified answer
7*3¹¹ +7 =7*(3¹¹+1) =7*(3¹¹+1¹¹) =7*(3+1)* A =28A ;
A =3¹⁰-3⁹*1 +3⁸*1² -3⁷*1³ + ... +3²*1⁸ -3*1⁹+ 1¹⁰.