Question

СРОЧНО!!! 
Сократите дробь 28^n+5/ 7^n+3* 2^2n+9

Answer 1

28 ^ ( N + 5 ) = 7 ^ ( N + 5) * 2 ^ ( 2*( N + 5) ) = 7 ^( N+5) * 2 ^ ( 2N + 10 )
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( 7 ^ ( N+5) * 2 ^ ( 2N + 10)) / ( 7 ^( N+3) * 2^ ( 2N + 9)) =
= 7 ^ ( N + 5 - ( N + 3 ) ) * 2 ^ ( 2N + 10 - ( 2N + 9)) =
= 7 ^ 2 * 2 ^ 1 = 49 * 2 = 98
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 Ответ 98

Answer 2

$frac{28^{n+5}}{7^{n+3}*2^{2n+9}} = frac{(2^{2})^{n+5}*7^{n+5}}{7^{n+3}*2^{2n+9}} =2*7^{2}=98$