(16,2-1 14/15):(1 5/7+3 8/21)

1) 16,2 - 1 ( 14/15 ) = 16 ( 1/5 ) - 1 ( 14/15 ) = 16 ( 3/15 ) - 1 ( 14/15 ) =    = 15 ( 18/15 ) - 1 ( 14/15 ) = 14 ( 4/15 )2) 1 ( 5/7 ) + 3 ( 8/21 ) = 1 ( 15/21 ) + 3 ( 8/21 ) = 4 ( 23/21 ) = 5 ( 2/21 ) 3) 14 ( 4/15 ) : 5 ( 2/21 ) = ( 214/15 ) : ( 107/21 ) = 42/15 = 2,8 ОТВЕТ 2,8