1)6,4/15-2,1/9+1,3/10 2)7,2/4-5,5/36+3,3/8 3)12,17/42-(3,1/4+4,1/6) 4)10,9/22-3,7/11-4,8/33 5)15-(6,4/35-2,3/14)

1) 6 4/15 - 2 1/9 + 1 3/10 = 94/15 - 19/9 + 13/10 = 8460/1350 - 2850/1350 + 1755/1350 =

= (8460 - 2850 + 1755)/1350 = 7365/1350 = 5 615/1350 = 5 41/90; 

2) 7 2/4 - 5 5/36 + 3 3/8 = 30/4 - 185/36 + 27/8 = 540/72 - 370/72 + 243/72 = 

 = (540 - 370 + 243)/72 = 413/72 = 5 53/72;

3) 12 17/42 - (3 1/4 + 4 1/6) = 521/42 - 13/4 - 25/6 = 1042/84 - 273/84 - 350/84 =

= (1042 - 273 - 350)/84 = 419/84 = 4 83/84;

4) 10 9/22 - 3 7/11 - 4 8/33 = 229/22 - 40/11 - 140/33 = 687/66 - 240/66- 280/66 =

= (687 - 240 - 280)/66 = 167/66 = 2 35/664

5) 15 - (6 4/35 - 2 3/14) = 15 - 214/35 + 31/14 = 1050/70 - 428/70 + 155/70 =

= (1050 - 428 + 155)/70 = 777/70 = 111/10 = 11,1