Mr and Mrs Davis have a son. His name is Bobby, and it was his birthday a few days ago.
Last Sunday Bobby's grandfather came to visit them, and he brought Bobby a nice toy train. When he gave it to Bobby, he said: "I'm sorry, Bobby, but I forgot your birthday last Tuesday, so I give you this present then."
"Oh, that doesn't matter Grandpa," Bobby answered. "Thank you very much. It's just what I wanted."
"And how old are you now, Bobby?" his grandfather asked. Bobby knew the answer to that question. "I'm five, Grandpa," he said.
"That's good," the old man said. "You're a big boy now, Bobby. And what are you going to be when you're older?" Bobby knew the answer to that question, too. "I' m going to be six, Grandpa," he answered
Этот?
A и a + 2 -- пусть два положительных числа, тогда
a* (a + 2) = 168
Получим
a^2 + 2a - 168 = 0
D = 4 + 672 = 676 = 26^2
a1 = ( - 2 + 26)/2 = 24/2 = 12
a2 < 0 (не удовлетворяет условию задачи)
a = 12;
a + 2 = 14;
Ответ
12; 14
5,8y-15,1y=38,29 -1,09
-9,3y=37,2
y=-4
Х3-6х2+12х-4+х3+6х2+12х+4=2х(х2-1)+3
2х3+24х-2х3+2х=3
26х=3
х=3/26
B₁=-25 q=-1/5 b₇-?
b₇=-25*(-1/5)⁶=-5²*(-5)⁻⁶=-5²*5⁻⁶=-5⁻⁴=-1/625.