X = 1; 1/9; 2_3/5; 8/3.
1 1/3 : X = 1_1/3 12 20/39 1/2
1_1/3:х=4/3:х
1_1/3=4/3
4/3:1/9=4/3*9/1=12
4/3:13/5 = 4/3 * 5/13 = 20/39
4/3:8/3= 4/3*3/8= 1/2
((49/8)*(9/7)-(39/14)*(21/13))*(8/5)
(63/8-9/2)*8/5
63/5-36/5
27/5 или 5.4
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