Предмет: Математика, автор: Oxanch

При уборке урожая с каждого из двух участков собрано по 210 центнеров пшеницы. площадь первого участка была на 0,5 гектар меньше площади второго участка. сколько центнеров пшеницы собрано с одного гектара на каждом участке если урожай на первом участке был на 1 центнер с одного гектара больше, чем на втором. РЕШИТЬ ТАБЛИЦЕЙ!

Ответы

Автор ответа: ATLAS
0

Показатели

 Первый участок

Второй участок

Площадь S (га)

Х-0,5

Х

Урожайность (ц/га)

210/(х-0,5)

210/х

Собрано (га)

210

210

 

Составляем уравнение:

210/(х-0,5) – 210/х = 1 |*x(x-0,5)

210x-210(x-0,5)=x^2-0,5x

210x-210x+105= x^2-0,5x

x^2-0,5x-105=0

D=0,25+4*105=420,25

X1=(0,5+20,5):2=10,5

X2=(0,5-20,5):2=-10<0  не подходит, т.к. х –натуральное число,

Следовательно х=10,5(га)-площадь второго  участка

Х-0,5=10,5-0,5=10(га)-площадь второго участка

210/10=21(ц/га)-урожайность на первом участке

210/10,5=20(ц/га)-урожайность на втором участке

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mother was nowhere to be seen.

Melanie took the kittens home. She thought her pet cat would look after them.

Instead, she got a big surprise. Her cat wasn't interested in the kittens. And the

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"The kittens love their new rabbit mom. They don't leave her alone," says Melanie.

"It's amazing. They climb all over her and look to get milk from her. Summer just

sits there and lets them do it."

The kittens follow the rabbit everywhere. They don't like to be without her.

"They are all so cute together," says Melanie. "The kittens may start hopping

soon!"

1.What was the rabbit's name?

a) Bunny

b) Melanie

c) Summer

2. Where does Melanie work?

a) at an animal hospital

b) at a pet store

c) at a zoo

3. How many kittens did Melanie find?

a) 2

b) 3

c) 6

4. Why did Melanie take the kittens home?

a) She wanted to give the kittens away.

b) She had a pet cat who could be a mother to the kittens.

c) She was going to feed the kittens with a bottle.

5. What is unusual about this story?

a) Six kittens make a big litter.

b) It's unusual for kittens to want a rabbit as their mother.

c) It's unusual for a cat to leave her kittens.

6. Why did Melanie take the kittens home?

a)She wanted to give the kittens away.

b) She had a pet cat who could be a mother to the kittens.

c) She was going to feed the kittens with a bottle. помогите пожалуйста срочно​