Решите уравнение x+9/20=3/4 второе. 25/36-х=5/18
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1) х + 9/20 = 3/4

х = 15/20 - 9/20

х = 6/20 = 3/10

6/20 + 9/20 = 3/4

15/20 = 15/20

ответ: х = 6/20; 3/10

2) 25/36 - х = 5/18

25/36 - х = 10/36

х = 25/36 - 10/36

х = 15/36 = 5/12

25/36 - 15/36 = 5/18

10/36 = 10/36

ответ: х = 15/36; 5/12