Предмет: Алгебра, автор: liust2001


Помогите пожалуйста нужно до завтра:))
Алгебра
1. Упростите выражение: 2х ( 2х + 3у) – (х + у)2 .
2. Решите систему уравнений : 4х – у = 9;
3х + 7у = - 1.

3. а) Постройте график функции у = 2х + 2.
б) Определите, проходит ли график функции через точку А(- 10; - 18).


4. Разложите на множители: а) 3а2 – 9аb ; б) х3 – 25х.

5. По электронной почте послано три сообщения объемом 600 килобайт. Объем первого сообщения на 300 килобайт меньше объема третьего сообщения и в 3 раза меньше объема второго. Найдите объем каждого сообщения.

Ответы

Автор ответа: darkangel20161
1
1) 3x^2 + 4 xy - y^2
2) { y = 9-4x                             { y = 9-4* 2.14/25(дробь)      
    { 3x + 7 ( 9 - 4x) = -1              { x = 2 целых 14/25
----------------------------------
{ y = - 1 целая 16/25 
{ x = 2 целых 14/25
4) a) 3a( a-3b)
    b) x(x^2 - 25) 
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Ответить на вопросы :
1 Answer the questions.


1. What's the weather like today?

2. What are the kittens doing?

3. Are the films interesting?

4. Is Blackie angry?

5. What are the films about?

6. Is Reddy hungry?

7. Do they have lunch?


3 Complete.


1. Let's watch a f _____.

2. When I see a mouse, I am h _____.

3. Let's have l _____.


4 What is it?


1. It is big or small. It can sing and fly.

2. It is big or small. It can't talk but it can swim.

3. Cats catch it. It is small. It has got a long tail.

4. You can watch it. It is interesting.

СРОЧНООООО !!!!!!!!!!