Решите уравнения: 1) y:1 5/31=7 3/4:1/3 2) 2+х/5=4/9

Question

Решите уравнения:
1) y:1 5/31=7 3/4:1/3
2) 2+х/5=4/9

Answer 1

Х * 1/3 = 7 3/4 * 1 5/31
х * 1/3 = 31/4 * 36 /31
х * 1/3 = 12/31
х = 12/31*3 = 36/31 = 1 5/31

Comments

31/4*36/31=9

Answer 2

У:1 5/31=7 3/4:1/3
1/3 у=1 5/31*7 3/4
1/3 у=36/31*31/4
1/3 у=9
у=9:1/3
у=27

2+х/5=4/9
х/5=4/9-2
х/5=-1 5/9
х/5=-14/9
х=-14/9*5
х=-70/9
х=-7 7/9