Một vật có khối lượng 50kg, ng ta kéo nó chuyển động đều trên mặt sàn nằm ngang vs lực kéo bằng 1/5 trọng lượng của vật
a/Hỏi có bao nhiêu lực tác dụng lên vật khi nó chuyển động đều ?
Tính độ lớn của các lực này?
Biểu diễn các lực theo tỉ lệ xích do em chọn
Giusp mình câu in đậm vs ....cảm mơn. Câu in đậm thôi nha
chia động từ trong dấu ngoặc ở thì hiện tại hoàn thành hoặc thì quá khứ đơn
1. Last month our class ( go)..........on a trip with our teacher. We ( not have )........another trip since then.
2. I (live) .....with my grandmother when I (be)........16. Since then , I (not meet)..my grandmother again
3. My moher(work).....á a teacher in the in the local high school for 20 years before her retirement
4. The last time we( have) .........dinner together was 2 weeks ago
5. My uncle (not meet)........his family since he (go)..............on a business trip last month.
6. Your friend, Sarah (jusst/phone).........you . She (say).......... sorry because she couldn't come to your party
7. So far, I( read ) .............11 diferent books . My most favorite book is "paper towns" by John Green.I (finish).............reading it last weekend
help me
1. You(have lied/have lain ) in bed since the morning . Get up and find something else to do
2. They (were / have lain )close friends for 3 months but now they hate each other
3. (Have you ever tried/ Did you try ) ice-skating when you were a kid ?
4. How long ( Have you taught / did you teach) in this primary school ?
5. The last time we met ( has been / was ) ten days ago
6. You (have eaten / haven't eaten) anything since yesterday . You must be very hungry now
7. We (have been/ have never been ) to this place before. This is the first time
Chọn câu tả lời đúng nha !!! help me cảm ơn nhìu
Khoanh vào đáp án đúng
1. His mother hasn't prepared the meal ( already/yet)
2. Tommy (worked/has worked) for this company for 2 years but nơ he doesn't work here
3. This machine (has worked /worked) for ten years so far
4. Mr.Hai (has established/established)this non-profit organization last month
5. Jane's (not been/not) a member of the volunteer club since he left school
6.Her husband (has given up/gave up)smoking when they had their first child
7.(Have you read/ Did you read) this book yet ?
8. I lost my key on my way home last night. Up to now I (didn't find/haven't found ) it
Cho tam giác ABC cân tại A . Gọi D, E , F lần lượt là trung điểm AB,AC,BC. K là điểm đối xứng vs F qua E
a. C/m BDEC là ht cân
b. C/m AFCK là hình chữ nhật
c. C/m ADFE là hình thoi
AI JUP MK CÂU C VỚI . CHỈ CẦN CÂU C THÔI Ạ ! CẢM ƠN NHÌU . MÌNH K CẦN GIÚP CÂU A VS B NHÉ