Cho dãy số 1,2,3,......, 87. tính trung bình của dãy số trên.
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Bài 1 :
Phong cần ít nhất : 68 : 5 = 13 túi và dư 3 kg
Bài 2 :
Mẹ Chi có thể may được nhiều nhất : 83 : 8 = 80 là cờ và còn thừa 3 m vải
Đúng#
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1. She's cold. ............ She is
............... cold.
2.They're happy. .......... They are
.................. happy.
3.I'm hungry. .......... I am
................... hungry.
4.We're thirsty. ........... We are
................... thirsty.
5.You're brave. ......... You are
..................... breve.
6.He's sad. .......... He is
.................... sad.
1. She is cold
2. They are happy
3. I am hungry
4. We are thirsty
5. You are breve
6. He is sad
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TL :
There are ....... pegs
A . PE B . Their C. Our D .Sandwich
Đáp án ý C : (There are our pegs)
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Bạn Ace Râu Trắng ơi !
Đáp án : 2010 là thế kỉ thứ 21 bạn nhé
# Học tốt #
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Everyday morning, I get up at 5:30. After brushing my teeth and washing my face, I usually have breakfast at 6:30 a.m. I go to work by motorbike and be there at about 7:15 a.m. It takes me about 15 minutes from my house to get to my school. I usually start my work at 7:30 a.m. I stop at 11:45 a.m for my lunch in my school office. In the afternoon, I finish my work at 5:30 p.m, then I go home. I always spend my time on cooking dinner for my small family and we usually have dinner at 7:30 p.m. After dinner, we often watch TV and play with our son. After that, I always prepare my lessons plan and go to bed at 11:00 pm. On weekends, I usually go out with my family or friends.
hok ##
Everyday morning, I get up at 5:30. After brushing my teeth and washing my face, I usually have breakfast at 6:30 a.m. I go to work by motorbike and be there at about 7:15 a.m. It takes me about 15 minutes from my house to get to my school. I usually start my work at 7:30 a.m. I stop at 11:45 a.m for my lunch in my school office. In the afternoon, I finish my work at 5:30 p.m, then I go home. I always spend my time on cooking dinner for my small family and we usually have dinner at 7:30 p.m. After dinner, we often watch TV and play with our son. After that, I always prepare my lessons plan and go to bed at 11:00 pm. On weekends, I usually go out with my family or friends.
khoảng cách của dãy số trên là 1
có số các số là:(87-1):1+1=87(số hạng)
tổng dãy số là (87+1)nhaan87 :2=3838
trung bình cộng của dãy số trên là 3838:87=44
đáp số :44
Dãy trên có:
(87-1):1+1=87(số)
Tổng của dãy trên là:
(87+1)x87:2=3828
Trung bình cộng dãy trên là:
3828:87=44
Đáp số:44