(?)+(?)=8
+ +
(?)-(?)=6
= =
13 8​
(только целые числа)​

Х - ширина площадки

(х + 10) - длина площадки , по условию задачи имеем : х *(х +10) = 9000

x^2 + 10x = 9000

x^2 + 10x - 9000 =0 . Найдем дискриминант квадратного уравнения - D

D = 10^2 - 4*1*(-9000) = 100 + 36000 = 36100 . Кореньквадратный из дискриминанта равен 190 . Найдем корени квадратного уравнения : 1-ый = (- 10 + 190)/2*1 =180/2 = 90 ; 2-ой = (-10 - 190)/2*1 = -200/2 = - 100 . Второй корень не подходит так как х - это ширина площадки , а она не может быть меньше 0 . Значит ширина площадки равна 90 м. Отсюда длина площадки равна : х + 10 = 90 + 10 = 100 м

There was a hare in the world.  How many lived.  so many

‚And shivered: I was afraid of everything, everything

offended.  All ostrashka gave.  During the day and at night

trembled.  So he once tired of living and trembling,

that he began to curse his fate:

- And what a bitter share I had: all fear

camping  He said to himself in hearts.  - who just me not

is haunting!  I don't want to live in the world anymore.

And the hare ran to the river to drown.  Runs and sees - at

water fence itself is set.  He skipped 0 times

running through a hedge And then from under his nose.  startling-

SIX.  shied away And plopped into the water of the FROG.

-Uh  and me.  it turns out.  fear!  - thought the hare.  -

There are some worse than mine.  There is no need for me to drown now

I will live.  like all others LIVE. "

Since then, the hare lives.  pleased with that.  what.  if a

will want to.  he might scare someone.