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8 tháng 11 2021
a) \(\left(3x-1\right)^6=\left(3x-1\right)^4\)
\(\Rightarrow\left[{}\begin{matrix}3x-1=0\\3x-1=1\\3x-1=-1\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{3}\\x=\dfrac{2}{3}\\x=0\end{matrix}\right.\)
b) Áp dụng t/c dtsbn:
\(\dfrac{a+b-c}{c}=\dfrac{a-b+c}{b}=\dfrac{-a+b+c}{a}=\dfrac{a+b+c}{a+b+c}=1\)
\(\Rightarrow\left\{{}\begin{matrix}a+b-c=c\\a-b+c=b\\-a+b+c=a\end{matrix}\right.\)\(\Rightarrow\left\{{}\begin{matrix}a+b=2c\\a+c=2b\\b+c=2a\end{matrix}\right.\)
\(\Rightarrow M=\dfrac{\left(a+b\right)\left(b+c\right)\left(c+a\right)}{abc}=\dfrac{2a.2b.2c}{abc}=8\)
Help meeeee
DT
Đỗ Thanh Hải
CTVVIP
24 tháng 9 2021
1 went
2 have never been
3 haven't seen
4 saw
5 have they been
6 got
7 have already done
25 tháng 9 2021
1. I went to the new Mexican restaurant yesterday.
2. I have never been there. Did you like it?
3. I have not seen Ann for a very long time.
4. Really? I saw her yesterday at the gym.
5. How long have they been married?
6. Only a year. They got married last June.
7. No, you don't have to. I have already done it.
help meeeee
30 tháng 4 2017
Ta có :
\(\dfrac{x}{5}=\dfrac{2}{3}\)
\(\Rightarrow x.3=5.2\)
\(x.3=10\)
\(x=10:3\)
\(x=\dfrac{10}{3}\)
Vậy \(x=\dfrac{10}{3}\) là giá trị cần tìm
30 tháng 4 2017
Ta có :\(\dfrac{x}{5}=\dfrac{2}{3}\)
\(\Rightarrow x.3=2.5\)
\(x.3=10\)
\(x=10:3\)
\(\Rightarrow x=\dfrac{10}{3}\)
Vậy \(x=\dfrac{10}{3}\)
Vậy \(x=\dfrac{10}{3}\)
1. Where does Mai live ?
2. Where's your mother's picture ?
3. When do you play soccer ?
4. Where do they work ?
5. Why you want to go to the swimming pool ?
6. Why she stayed at home ?
7. How often they go to the music club ?
8. What does you father doing now ?
10. What would he to be in the future ?
11. ( phương tiện ) How did she travel to HaNoi last week ?
( địa điểm ) Where did she travel last week ?
Làm hơi khác Quỳnh một chút , thấy hợp lí hơn :
1, Where does Mai live?
2, Whose picture is on the wall ?
3, When do you play soccer ?
4, Where do they work ?
5, Why do you want to go to the swimming?
6, Why did she stay at home ?
7, How often do they go to the music club ?
8, What is your father going to do tonight ? ( Thì Tương lai gần mà Quỳnh :)) ?
10, What would he lik e to be in the future?
11, How did she travelled to Ha Noi last week ?