1.(5х-9-5)(5х-9) + 6 = 0
(5х - 14)(5х-9) +6 = 0
25х²-70х-45х+126 + 6 = 0
25х²-115х + 132 = 0
D = 115²-4*25*132 = 25
х1 = 25 + 5/50 = 3/5
х2 = 25-5/50 = 2/5
2. 11(х+15)/х(х+15) - 6х/х(х+15) = 0
11х + 165/х² + 15х = 6х/х² + 15х
11х + 165 = 6х
11х - 6х = -165
5х = -165
х = - 33
не имеет значения при х = 0 и -15
3. 12х - 29/10х + 10(12х - 29) = 10х + 10/12х-29(10х+10)
12х - 29/120х² - 170х - 290 = 10х + 10/120х² - 170х - 290
12х - 29 = 10х + 10
2х = 39
х = 19.5
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