Математика номер 782

Question

Математика номер 782

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Answer 1

1. Х=2/3Х-1
3Х=2Х-3
3Х-2Х=-3
Х=-3

2. Х=1/2=3/4-Х
Х×Х=3/4+1/2
2Х=5/4
Х=5/8

3. Х-2/3=5/6Х
6Х-4=5Х
6Х-5Х=4
Х=4
4
4. 1 ---Y=Y+4
5
4/5Y=Y+4
4Y=5Y=20
4Y-5Y=20
-Y=20
Y=-20

5. 2/3Y-1/3=5/9Y
6Y-3=5Y
6Y-5Y=3
Y=3

6. 3/4Y-2/3=7/12Y
9Y-8=7Y
9Y-7Y=8
2Y=8
Y=4