Giải:

\(\left(x+2\right)^2=16\)

\(\left(x+2\right)^2=4^2\)

Vì \(2=2\)

Nên \(x+2=4\)

\(\Leftrightarrow x=4-2\)

\(\Leftrightarrow x=2\)

Vậy \(x=2\).

Chúc bạn học tốt!

bạn xuống xe bỏ xe ở lại và 1 mình đi qua cầu là được

Giải:

a) \(\left(-1\right).\left(-2\right).\left(-3\right).\left(-4\right).\left(-5\right).\left[\left(-3\right)-\left(-5\right)\right]\)

\(=2.12.\left(-5\right).2\)

\(=24.\left(-10\right)\)

\(=-240\)

b) \(1-2+3-4+5-6+...-98+99\)

\(=\left(1-2\right)+\left(3-4\right)+\left(5-6\right)+...+\left(97-98\right)+99\)

\(=\left(-1\right)+\left(-1\right)+\left(-1\right)+...+\left(-1\right)+99\)

\(=49.\left(-1\right)+99\)

\(=-49+99\)

\(=50\)

Chúc bạn học tốt!

1.

How many anything are there in the bathroom?

- There are a sink, a tub and a shower in the bathroom.

2.

Are there any books on the table?

- No, there aren't any books on the table.

3.

Who is the oldest in your family?

- The oldest in my family is my grandfather.

4.

What does he do?

- He is a farmer.

5.

Where are thay work?

- They work in a factory.

6.

Is there a refrigerator in the kitchen?

- Yes, there is a refrigerator in the kitchen.

7.

How about Ha Noi with Hue?

- Ha Noi is bigger than Hue.

8.

What number is the newest apartment at?

- The newest apartment is at number 27.

1. They (not go) ____don't go____ to the zoo very often.

2. I (not be) ____isn't going to____ at home next Monday evening.

3. Het father (work) __works______ from the morning till night every day.

4. Mr. Robinson (look) ____is looking____ for ab apartment at present.

5. There (be) ____is____ a few empty apartments near his office.

6. Hoa's parents love (work) ____to work____ on their farm.

7. Is it easy (find) ____find____ an apartment in Ha Noi?

8. Please tell her I (call) ____call____ again later.

Giải:

a) Hình vẽ trên.

b) Vùng đặt mắt để nhìn thấy đồng thời cả A và B là RA' và B'B (theo hình vẽ).

Chúc bạn học tốt!