а) 1 - а = 130/300 + 90/3001 - а = 220/3001 - а = 11/15а = 1 - 11/15а = 15/15 - 11/15а = 4/15
б) k/100 = 3/3k = 100 * 3/3k = 100
Ответ:а) а = 4/15б) k = 100
а) 1 - а = 130/300 + 90/300
1 - а = 220/300
1 - а = 11/15
а = 1 - 11/15
а = 15/15 - 11/15
а = 4/15
б) k/100 = 3/3
k = 100 * 3/3
k = 100
Ответ:
а) а = 4/15
б) k = 100