1) 1 1\9 - 5 1\3 = - 5 3\9 + 1 1\9 = - 4 2\9 2) - 1\5 + 2.1 = 2 1\10 - 2\10 = 1 11\10 - 2\10 = 1 9\10 3) ( - 4 2\9 ) : 1 9\10 = ( - 38\9 ) : ( 19\10) = ( - 20\9 ) = ( - 2 2\9 )