1) 18 - 17 41/60 + 1 5/18 - 3, 95 + 4 7/9 - 2 11/30

= 18 - 17 + 78/60 + 5/18 - 3,95 + 28/9 - 33/30

= 1 + 78/60 + 5/18 - 3, 95 + 28/9 - 33/30

= 1 + 78/60 + 5/18 - 5,9 + 28/9 - 33/30

= 1 + 78/60 + 25/54 - 5,9 + 28/9 - 33/30

= 1 + 133/60 - 5, 9 + 28/9 - 33/30

= 1 + 133/60 - 6, 8 + 28/9 - 33/30

= 134/60 - 6, 8 + 28/9 - 33/30

= 67/30 - 6, 8 + 28/9 - 33/30

= 67/30 - 6 + 28/9 - 33/30

= 67/30 - 6 + 224/90 - 33/30

= 289/90 - 6 - 33/30

= 256/90 - 6

= 256/90 - 6 x (30/30)

= 256/90 - 6 x 1

= 256 - 180

= 76

2) (5 7/15) - 4 1/12 = 82/15 - 49/12 = 4*82-5* 60

(1 23/60) - 1, 12 = 751/300 = 2 151/300

= 2 151/300 - 3 23/30 = 751/300 - 113/30 = (751 - 1)/30

(- 1 79/300) + 7 5/6 = - 379/300 + 47/6 = -379+ 3

(6 57/100) * 3 ,57= 300 100 = 3*700 1*700 =3