Giải

Xét tam giác ABC có: 

BAC = \(180^∗\)- ABC - ACB ( tổng 3 góc trong 1 tam giác = \(180^∗\))

Suy ra: BAC = \(180^∗\)- \(70^∗\)-\(30^∗\)= \(80^∗\)= ACD

Hai góc BAC và ACD ở vị trí so le trong => AB//CD

Giải

Độ dài quãng đường đó là:

1,609344 . 200 = 321,8688 (Km)

Làm tròn kết quả với độ chính xác 0,5 là 322 Km.

(-0,25)⁵ : x = (-0,25)³

x= (-0,25)⁵ : (-0,25)³

x= (-0,25)²

x= 0,0625

a, 0,75 + \(\dfrac{9}{5}\)(1,5 - \(\dfrac{2}{3}\))²

^{= 0,75 + \(\dfrac{9}{5}\)}(\(\dfrac{5}{6}\))²

=0,75 + \(\dfrac{5}{4}\)

= 0,75 + 1,25= 2

Write a passage to give advice on how to stay healthy.

                                                                             bài làm

Viruses can cause many diseases. It can be serious and lead to hospitalization. Here is some advice on how to avoid viruses. You should keep your room clean, often open windows. You also keep clean hands by regulary washing your hands with soap and water. Besides, you should maintain a healthy lifestyle. You can it more fruit and vegetables and exercise frequently. You should wear a mask when going out. If it gets seriuos, you should go to the doctor for advice.

Bài 2:

1. Reuse mean using something again intead of throw it away.

2. Did your school organise a donation drive last winter ?

Bài 1:

1. My mother is fond of going jogging in the morning.

2. My sister finds is difficult to lift weights.

3. We collected plastic bottles and sent them to factory.