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El numero desconocido lo llamas x
5/6 = x/12
5 * 12 = 6x
60 = 6x
60/6 = x
10 = x
5/6 = 10/12
x/9 = 5/3
3x = 5 * 9
3x = 45
x = 45/3
x = 15
15/9 = 5/3
4/x = 28/49
4 * 49 = 28x
196 = 28x
196/28 = x
7 = x
4/7 = 28/49
Para saber si es mayor , menor e igual multiplicas en cruz.
4/5 7/8
(4 * 8) (7 * 5)
32 35
32 < 35 Luego
4/5 < 7/8
5/7 4/9
(5 * 9) (4 * 7)
45 28
45 > 28 Luego
5/7 > 4/9
7/10 5/8
(7 * 8) (10 * 5)
56 50
56 > 50 Luego
7/10 > 5/8