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е) (3/7*33/40 + 5/6) : 1 11/12 =  997/1610

3/7*33/40 = 99/280
99/280+5/6= 297/840 + 700/840 = 997/840
997/840:1 11/12 = 997/840:23/12 = 997/840*12/23=997/1610

ж)  (6 7/12 - 3 17/36)*1/2 - 4 1/3:13/20 =  - 6 8/9

6 7/12 - 3 17/36 = (6-3) + (7/12 - 17/36) = 3 + (21/36 - 17/36) = 3 4/36 = 3 1/9
3 1/9*1/2 = 28/9*1/2= 14/9 = 1 5/9

4 1/3:13/20 = 13/3:13/20 = 13/3*20/13 = 20/3 = 6 2/3

1 5/9 - 6 2/3 = 1 5/9 - 6 6/9 = 14/9 - 6 6/9 = (0 -6) + (14/9 - 6/9) = -6 8/9


з)  (1 11/24 + 13/36)*1 11/25 - 8/15*9/16 = 2 8/25

1 11/24 + 13/36 = 1 33/72 + 26/72 = 1 59/72
1 59/72*1 11/25 = 131/72* 36/25 = 131/50 = 2 31/50


8/15*9/16 = 9/30

2 31/50 - 9/30 = 2 93/150 - 45/150 = 2 48/150 = 2 8/25


и) 2 1/2 *48 - 3 2/3: 1/18 + 5 5/12:7/36 = 26 1/7

2 1/2 *48 = 5/2*48 = 120
3 2/3: 1/18 = 11/3 *18/1 = 66
5 5/12:7/36  = 65/12*36/7 = 195/7 = 27 6/7

120 - 66 + 27 6/7 = 54 -  27 6/7 = 53 7/7 - 27 6/7 = 26 1/7

 
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