Решите примеры 1)2целых 1\7 + 3целых 3\2 + 4целых 5\21,.....2)5 6\7+2 4\5+4целых 8\21......3)5 5\9+7 3\5+1 7\18......4)5

1) 2 1/7 + 3 3/2 + 4 5/21 = 15/7 + 9/2 + 89/21 = 30/14 + 63/14 + 89/21 = 93/14 + 89/21 = 279/42 + 178/42 = 457/42 = 10 37/42.

2) 5 6/7 + 2 4/5 + 4 8/21 = 41/7 + 14/5 + 84/21 = 205/35 + 98/35 + 84/21 = 303/35 + 84/21 = 909/105 + 420/105 = 1329/105 = 12 69/105 = 12 23/35.

3) 5 5/9 + 7 3/5 + 1 7/18 = 49/9 + 38/5 + 25/18 = 245/45 + 342/45 + 25/18 = 587/45 + 25/18 = 1174/90 + 125/90 = 1299/90 = 14 39/90 = 14 13/30.

4) 5 3/4 + 3 8/9 + 6 3/18 = 23/4 + 35/9 + 111/18 = 207/36 + 140/36 + 111/18 = 347/36 + 111/18 = 347/36 + 222/36 = 569/36 = 15 29/36.

5) 2 3/8 + 6 5/12 + 4 5/14 = 19/8 + 77/12 + 61/14 = 57/24 + 154/24 + 61/14 = 211/24 + 61/14 = 1477/168 + 732/168 = 2209/168 = 13 25/168.

6) 12 7/12 + 3 8/9 - 4 3/4 = 151/12 + 35/9 - 19/4 = 453/36 + 140/36 - 19/4 = 593/36 - 19/4 = 593/36 - 171/36 = 422/36 = 11 26/36 = 11 13/18.

7) 10 5/12 + 5 11/36 - 8 3/8 = 125/12 + 191/36 - 67/8 = 375/36 + 191/36 - 67/8 = 566/36 - 67/8 = 1132/72 - 603/72 = 529/72 = 7 25/72.

8) 8 7/8 + 3 2/5 - 2 3/4 = 71/8 + 17/5 - 11/4 = 355/40 + 136/40 - 11/4 = 491/40 - 11/4 = 491/40 - 110/40 = 381/40 = 9 21/40.

9) 9 11/12 + 4 8/15 - 5 7/20 = 119/12 + 68/15 - 107/20 = 595/60 + 272/60 - 107/20 = 867/60 - 107/20 = 867/60 - 321/60 = 546/60 = 9 6/60 = 9 1/10.

10) 7 5/18 + 3 8/27 - 6 7/9 = 131/18 + 89/27 - 61/9 = 393/54 + 178/54 - 61/9 = 571/54 - 61/9 = 571/54 - 366/54 = 205/54 = 3 43/54.