Сократите дробь -5с^2+4с+1 __________ 1-25с^2

- 5с + 4с + 1 = ( - 5) *( c + 0,2 )( c - 1 ) = ( 1 - 5c )( c - 1 ) В = 16 + 20 = 36 ; √ D = 6 c1 = ( - 4 + 6 ) : ( - 10 ) = - 0,2 c2 = ( - 4 - 6 ) : ( - 10 ) = 1 ------------------------------------------------------ 1 - 25c = ( 1 - 5c )( 1 + 5c ) ------------------------------------------------------- [ ( 1 - 5c )( c - 1 ) ] / [ ( 1 - 5c )( 1 + 5c ) ] = ( c - 1 ) /( 1 + 5c ) ОТВЕТ ( с - 1 ) / ( 1 + 5с )