Question

а/4а-1:а^2/16а^2-8а+1 при а=1/7

Answer 1

A/( 4a - 1 ) : a^2/( 16a^2 - 8a + 1 ) = a/( 4a - 1 ) : a^2/( 4a - 1 )^2 = 4a - 1 
a = 1/7 
4 * ( 1/7 ) - 1 = 4/7 - 7/7 = - 3/7 
Ответ ( - 3/7 )