Giải giúp mình câu hỏi này với 4 : 12,5
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Đặt \(A=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+...+\frac{1}{1024}\)
\(2A=1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+...+\frac{1}{1024}\)
\(2A-A=\left(1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+...+\frac{1}{1024}\right)-\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+...+\frac{1}{1024}\right)\)
\(\Rightarrow A=1-\frac{1}{1024}=\frac{1023}{1024}\)
\(\dfrac{8}{3}\)=1\(\dfrac{5}{3}\) \(\dfrac{15}{6}\)=1\(\dfrac{9}{6}\)
\(\dfrac{85}{12}\)=7\(\dfrac{1}{12}\) \(\dfrac{5}{2}\)=1\(\dfrac{3}{2}\)
Chúc bạn học tốt.
\(\dfrac{8}{3}\rightarrow2\dfrac{2}{3}\)
\(\dfrac{15}{6}=\dfrac{5}{2}\rightarrow2\dfrac{1}{2}\)
\(\dfrac{85}{12}\rightarrow7\dfrac{1}{12}\)
\(\dfrac{5}{2}\rightarrow2\dfrac{1}{2}\)
6 How often does your grandfather often listen to the radio
7 How often do you go to the gym
8 What did they send
9 What time did he leave the party
10 Where did he go
11 Who did he meet for coffee
12 Why did she called the firemen
13 How did he go to school
14 What does lan like doing
15 Where was your father last months
16 How much is the dictionary
17 How long did it take to finish the composition
18 Who bought a poster
What did Mrs Robinson by
19 Where is a restaurant
20 What did her neighbor give her
21 How was the homework yesterday
22 Do you have magaazine and newspapers
23 How often do you go to the movies
Câu 4)
Có 3 dạng cơ năng
- thế năng hấp dẫn : quả bính đang bay
- thế năng đần hồi : lò xo
- động năng : ô tô đang chạy
Câu 5)
Năng lượng vẫn đc bảo toàn và nó chỉ chuyển từ dạng này sang dạng khác
\(-2,5\times\left(x+\dfrac{1}{5}\right)=\dfrac{7}{5}\)
\(\Leftrightarrow x+\dfrac{1}{5}=\dfrac{7}{5}:\left(-2,5\right)\)
\(\Leftrightarrow x+\dfrac{1}{5}=\dfrac{7}{5}\times\left(-\dfrac{2}{5}\right)\)
\(\Leftrightarrow x+\dfrac{1}{5}=-\dfrac{14}{25}\)
\(\Leftrightarrow x=-\dfrac{19}{25}\)
4:12,5=0,32
4 : 12,5 = 0,32
~H~
Hok tốt !