Cho tam giác ABC vuông tại A có AC = 3; AB = 4. Khi đó cosB bằng

Cho tam giác MNP vuông tại D. Biết DE = 5,2cm, DF = 6,3cm. Tính góc F (làm tròn đến độ)

Hình ảnh mặt cắt một quả đồi được mỉnh họa lả một DABC với các chi tiết như sau:

cạnh đáy là AC, BH ^ AC, BAC = 45°, AH = 200m, HC = 210m . Một nhóm học sinh đi dã ngoại

đi từ A lên đinh B rồi xuống dốc trở về C .

a)   Tính chiều cao con dốc ?

b)  Tính quãng đường nhóm học sinh đã đi từ A lên đỉnh B rồi xuống dốc trở về C ?

1. The ______ in my school always give the answer after the group did tasks. ( instruct )

2. We've just spent 200 million on ________ our computer network. ( improve )

3. You have to _____ wear a mask if you are at public places such as street, hospital, office,... ( compel )

4. _______ words from parents and teachers help children feel more confident. ( encourage )

1. The ______ in my school always give the answer after the group did tasks. ( instruct )

2. We've just spent 200 million on ________ our computer network. ( improve )

3. You have to _____ wear a mask if you are at public places such as street, hospital, office,... ( compel )

4. _______ words from parents and teachers help children feel more confident. ( encourage )

1. The teacher asked my friends: " How many activities do you want to enroll in this summer?"
=> The teacher asked my friends
2. Researchers started experimenting on monkeys to test the effectiveness of the vaccine three months ago.
=> Researchers have
3. We should provide food and unused clothes for people in flooded areas.
=> Food and unused clothes
4. His mother is unhappy because he always gets bad marks in English.
=> His mother wishes he

1. "Get up and prepare your lesson, Susan", said her father
=> Susan's father told
2. Lora began studying English three years ago
=> Lora has
3. They have to repair the engine of the car
=> The engine
4. Mary called her parrot, Henry
=> Mary's parrot