1) Áp dụng định lí Pytago vào ΔABC vuông tại A, ta được:

\(BC^2=AB^2+AC^2\)

\(\Leftrightarrow BC^2=6^2+8^2=100\)

hay BC=10(cm)

Áp dụng hệ thức lượng trong tam giác vuông vào ΔABC vuông tại A có AH là đường cao ứng với cạnh huyền BC, ta được:

\(AH\cdot BC=AB\cdot AC\)

\(\Leftrightarrow AH\cdot10=6\cdot8=48\)

hay AH=4,8(cm)

C

6 How do they travel to work?

7 Who speaks French very well?

8 What makes people different from all other animals?

IV

1 Because Nathan missed the bus, he was late for school

2 Keep the food covered or the flies will contaminate it

3 Julie hadd a guitar and she plays it very well

4 I need to study hard so I can get a good score on the test

5 Although he seemed a friendly person, I didn't like him

6 The food looks delicious but it tastes horrible

7 Mason fell because the floor was wet

8 Anna needed some money so she took a part-time job

1/ Nathan missed the bus because he was late for school.

2/Keep the food covered or the flies will contaminate it.

3/Julie has a guitar and she play it very well.

4/I need to study hard so I can get a good score on the test.

5/Although he seemed a friendly,I didn't like him.

6/The food looks deliciou but it tastes horribie.

7/ Mason fell because the floor was wet.

8/Anna took a part-time job so she needed some money.

d: =-100+720/718

=-35540/359

e: \(=5^3-9\cdot16=125-144=-19\)

f: \(=8\cdot9-7^2+7=72+7-49=30\)

ủa tìm x thì p có dầu bằng chứ?

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