1) у - 8 = 8/27
11 4/7 5 1/3
у - 8 = 8/27
81/7 16/3
у - 8 = 8 * 3
81/7 27 * 16
у - 8 = 1
81/7 18
у - 8 = 1/18 * 81/7
у - 8 = 1 * 81
18 * 7
у - 8 = 81/126
у - 8 = 9/14
у = 8 + 9/14
у = 8 ⁹/₁₄
2) 3/20 = 19 ⁴/₅
10/33 х- 15
3/20 * (х- 15) = 19 ⁴/₅ * 10/33
3/20 * (х - 15) = 99/5 * 10/33
3/20 * (х - 15) = 99 * 10
5 * 33
3/20 * ( х - 15) = 6
х - 15 = 6 : 3/20
х - 15 = 6 * 20
3
х - 15 = 40
х = 40 + 15 = 55
3) 5 ⁵/₉ = х - 19
2,5 7 ¹/₅
5 ⁵/₉ * 7 ¹/₅ = 2,5 * (х - 19)
50/9 * 36/5 = 2,5 * (х - 19)
50 * 36 = 2,5 * (х - 19)
9 * 5
40 = 2,5 * (х -19)
х - 19 = 40 : 2,5
х - 19 = 16
х = 16 + 19 = 35