15у^2-24y-2.7=0
5y^2-8y-0.9=0
D=64+17=81
1.Раскроем скобки
(У^2-3у-10)/3 - 11у.+12/10 =2-у - 2/3
2. Домножим все уравнение на 3,затем на 10, чтобы избавиться от знаментаеля
У^2-3у-10 - 33у + 36/10=2-у-2
10У^2-30у-100-330у+36=20-10у-20
3. 10у^2 - 350у-64=0
Сократим на 2:
5у^2 - 175у - 32=0
D=30625 +640=31 265
T=8
2x"+tx+8=0
2x"+tx= -8
x(2x+t)= -8
x=-8 2x+t=-8
2*(-8)+t= -8
-16+t=-8
t=-8+16
t=8
This summer I spent with my grandmother. We had fun, and not only rested well and worked, helped my beloved grandmother. We went to the river, there were a lot of people and I met a company of boys. We still communicate despite the distance. When I arrived home to my parents, I saw that my parents decided to surprise me by putting a huge pool that was the best summer of my life