Предмет: Алгебра, автор: karinazalza

точки М и Р лежат соответственно на сторонах АВ и ВС треугольника АВС
АВРВ=СВМВ докажите что МРIIАС

Ответы

Автор ответа: Аноним

1

$AB\cdot PB=CB\cdot MB~~\Leftrightarrow~~ \dfrac{AB}{MB}=\dfrac{CB}{PB}$

Значит, треугольники MBP и ABC подобны(если у 2 треугольников есть равные углы , а стороны , образовывающие эти углы пропорциональны , то треугольники подобны) у них угол В общий и соответственные углы А и М равны, следовательно, MP || AC

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: wystlie

помогите!!! Test 8-5
1. Fill in: pollution, global warming, poverty, endangered, famine, homeless.
1. Because of ________ our planet gets hotter and hotter.
2. The oil spill near Alaska in 1989 was the worst case of water _____ in history.
3. Many people have been left ________
4. There are a lot of ________ species on the planet.
5. We say that people live in _______ when they don’t have enough money to pay for their food or housing.
2. Complete the sentences with words derived from the words in bold.
1. The ________ at the theatre last night was unforgettable! PERFORM
2. Her sister made such a nice_________ for the party. INVITE
3. What are your__________ in food? PREFER
4. Thanks to the generous_________ new houses were built. DONATE
5. The__________ of a very important letter was a shock for us. DISAPPEAR
3. Put the verbs in brackets into –ing form or infinitive (with or without to)
1. He avoids ___________ (travel) by plane because of his phobia.
2. What you can ____________ (do) is just not to mind your business.
3. Let’s spend our weekend ____________(shop) downtown.
4. Mark has decided ____________ (become) a lawyer as his father.
5. Don’t let him _________ (eat) ice cream or he will get a sore throat.
4. Fill in: used to, be used to, get used to in the correct form.
1. When I was a child I _______________ (ask) a lot of questions.
2. Sue lives alone. It is not strange for her. She ____________________ (live) alone.
3. She’s been in Britain for three months and she can’t ______________ (drive) on the left.
4. Mike __________________ (do) his homework to music. It’s a usual way he does it.
5. Paul grew in a house by the sea, so he __________ (go) swimming every day.
5. Fill in the correct preposition.
1. A lot of doctors were called ______ to help people after the air crash.
2. Call ______ sometime and we’ll watch the new DVD together.
3. The meeting was called ______ but we still don’t know why.
4. A nurse often calls ______ my granny because she is not well.
5. The tsunami in Indonesia called_______ immediate action.
6. Fill in the correct preposition.
1. Relax, we are _____ of danger.
2. How ________ earth did you get here?
3. Only stupid people would keep lions as pets – they are wild _____ nature
4. After the hurricane Katrina New Orleans was _______ruins.
5. He was horrified to see his office ______ flames.

6 лет назад

Предмет: Алгебра, автор: vovanish

Чему равно значение выражения:

14x-y-(6x-5y)

если -2x-y=-2

6 лет назад

Предмет: Окружающий мир, автор: bratankostya

Доклад про Саванну 50 слов

6 лет назад

Предмет: Физика, автор: andrey0306

Конечная скорость автомобиля 54 км/ч. определите время разгона и ускорение автомобиля, если после начала движения он проехал 1,5 км?

9 лет назад

Предмет: Геометрия, автор: berryxcx

Какое из следующих утверждений верно?

Заранее благодарю, лучший ответ выберу :)

9 лет назад