NC
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K
Khách
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CN
2
PA
13 tháng 7 2016
\(\left(\frac{3}{7}\right)^{21}\div\left(\frac{9}{49}\right)^6=\left(\frac{3}{7}\right)^{21}\div\left[\left(\frac{3}{7}\right)^2\right]^6=\left(\frac{3}{7}\right)^{21}\div\left(\frac{3}{7}\right)^{12}=\left(\frac{3}{7}\right)^9\)
NN
13 tháng 7 2016
Bn chỉnh lại đề đi sao lại tiếng anh hả vào toán đi ko được tick đâu
NT
2
IM
19 tháng 7 2016
\(\left(-7\right)^x.\left(-7\right)^2=1\)
\(\Rightarrow\left(-7\right)^{x+2}=1\)
\(\Rightarrow\left(-7\right)^{x+2}=\left(-7\right)^0\)
=>x+2=0
=>x=-2
NT
0
Hãy viet một đoạn văn bằng tiếng anh từ 5-7 câu về:
DL
4 tháng 1 2017
The picture shows a street in a western country. The street is verycrowded with people who are walking on the street or waiting for the train.
There is a man sitting on a chair by the roadside to sell flowers to travellers in the foreground. There are two ancient buildings to the right and to the left of the street.
On the right side three trains aremoving slowly. A clock tower is sheltered from the left ancient building in the far distance.
The sky is clear and blue, and only a few fluffy clouds can be seen.
22 tháng 7 2018
VI. Make up question for the underlined part
1. I saw her last night.
..........When did you see her?......................................................................
2. Lan's mother gave her a nice dress
..................Who gave Lan a nice dress?................................................................
3. They returned to America two weeks ago.
.................When did They return to America?..........................................................................
4. Mrs Robinson bought a poster
............Who bought a poster?...........................................................
5. My father was in Ha Noi last month.
...............Where was your father last month?........................................................................
6. He traveled to Nha Trang by coach
.............How did He travel to Nha Trang ?......................................................................
7. she went to the doctor because she was sick
................Why did she go to the doctor? ..........................................
8. Nam left home at 7 o' clock yesterday
...................When did Nam leave home?.....................................................
\(\frac{3}{7}-\frac{4}{7}:\left(x-1\right)=\frac{-5}{7}\)
\(\frac{4}{7}:\left(x-1\right)=\frac{3}{7}-\left(\frac{-5}{7}\right)=\frac{8}{7}\)
\(x-1=\frac{4}{7}:\frac{8}{7}\)
\(x-1=\frac{1}{2}\)
=> \(x=\frac{1}{2}+1=\frac{3}{2}\)
Vậy x= \(\frac{3}{2}\)
Chúc bạn học tốt !
\(\frac{3}{7}-\frac{4}{7}:\left(x-1\right)=-\frac{5}{7}\)
\(\Leftrightarrow\frac{4}{7}:\left(x-1\right)=\frac{3}{7}-\left(-\frac{5}{7}\right)\)
\(\Leftrightarrow\frac{4}{7}:\left(x-1\right)=\frac{8}{7}\)
\(\Leftrightarrow x-1=\frac{4}{7}:\frac{8}{7}\)
\(\Leftrightarrow x-1=\frac{1}{2}\)
\(\Leftrightarrow x=1\frac{1}{2}\)
Vậy: \(x=1\frac{1}{2}\)