А) Определить кол-во корней можно используя дискриминант.
D > 0 => уравнение имеет ровно 2 корня,
D = 0 => уравнение имеет ровно 1 корень,
D < 0 => уравнение не имеет корней.
1) 2x^2-3x+6=0
a = 2, b = − 3, c = 6
D = (− 3)2 − 4 · 2 · 6 = 9 − 4 · 12 = − 39 - уравнение не имеет корней
2) 5x^2-x-4=0
a = 5, b = − 1, c = − 4
D = (− 1)2 − 4 · 5 · (− 4) = 1 − 4 · (− 20) = 1 + 4 · 20 = 81 - имеет 2 корня
Б)Так как корни имеет лишь 2-е уравнение то для него и найдем корни
x1 = (1 - √81)/(2·5) = (1 - 9)/10 = -8/10 = -0.8
x2 = (1 + √81)/(2·5) = (1 + 9)/10 = 10/10 = 1
Объяснение:
Не благодарите
1) Summer holidays are coming soon. I dream of having them like that.
Visit abroad. People are like my dream. For example, in Rome, wonder the great or in Paris to see firsthand the Eiffel Tower. Visit interesting museums and exhibition halls. Take lots of great photos. Buy souvenirs for memory. Get to know other people, feel the richness of various languages.
Someday my dream came true.
2)I remembered during the summer holidays that I went to the sea with my parents.
We swam there, had fun, sunbathing.
I really enjoyed my summer holidays, we fried kebab.
and when we arrived home we went to rest.
let's say.
I went to the sea with my parents and brother (sister), and there we saw a huge crab. We swam and frolic, and at sunset my dad made a fire, and we roasted marshmallows)
