9х = 1
Х = 1\9 (одна девятая)
По разрядам,по кол-ву цифр
1) 2 3/8 : 3 1/6 = 9,1 : х 2) 3 1/3 : 2 2/9 = 1,2 : х
2 3/8х = 3 1/6 * 9,1 3 1/3х = 2 2/9 * 1,2
2 3/8х = 19/6 * 91/10 3 1/3х = 20/9 * 12/10
19/3х = 1729/60 10/3х = 8/3
х = 1729/60 : 19/3 х = 8/3 : 10/3
х = 1729/60 * 3/19 х = 8/3 * 3/10
х = 91/20 = 4 11/20 х = 8/10
х = 4,55 х = 0,8
1) y + 1/4 = 4/5 - 3/10
y + 0.25 = 0.8 - 0.3
y + 0.25 = 0.5
y = 0.25
2) (4/5 - x) + 13/20 = 7/10
0.8 - x + 0.65 = 0.7
0.8 - x = 0.05
x = 0.75
3) 2/3 - (2/9 + x) = 1/3
2/3 - 2/9 - x = 1/3
6/9 - 2/9 - x = 3/9
4/9 - x = 3/9
x = 1/9