gấp lắm ạ
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{x}{27}=\dfrac{2}{9}-\dfrac{1}{3}\Rightarrow\dfrac{x}{27}=-\dfrac{1}{9}\Rightarrow\dfrac{x}{27}=\dfrac{-3}{27}\Rightarrow x=27\)
\(\dfrac{x}{27}=\dfrac{2}{9}-\dfrac{1}{3}=-\dfrac{1}{9}\Rightarrow x=-\dfrac{1}{9}.27=-3\).
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.2^{x+2}-2^x=96\\ 2^x\cdot4-2^x=96\\ 2^x\cdot\left(4-1\right)=96\\ 2^x\cdot3=96\\ 2^x=96:3\\ 2^x=32\\ 2^x=2^5\\ =>x=5\)
\(2^{x+1}\cdot3^y=12^x\\ 2^{x+1}\cdot3^y=3^x\cdot2^{2x}\\ \left\{{}\begin{matrix}2^{x+1}=2^{2x}\\3^y=3^x\end{matrix}\right.\\ \left\{{}\begin{matrix}x+1=2x\\y=x\end{matrix}\right.\\ \left\{{}\begin{matrix}x=1\\y=x=1\end{matrix}\right.\\ \left\{{}\begin{matrix}x=1\\y=1\end{matrix}\right.\)
\(c.10^x:5^y=20^y\\ 10^x:5^y=5^y\cdot4^y\\ 10^x=10^{2y}\\ =>x=2y\)
![](https://rs.olm.vn/images/avt/0.png?1311)
MgO: Mg có điện hóa trị 2+, O có điện hóa trị 2-
FeF3: Fe có điện hóa trị 3+, F có điện hóa trị 1-
BaCl2: Ba có điện hóa trị 2+, Cl có điện hóa trị 1-
Ca3N2: Ca có điện hóa trị 2+, N có điện hóa trị 3-
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\(4x^2+x=x\left(4x+1\right)\)
b)\(3x-9y=3\left(x-3y\right)\)
c)\(5\left(x-y\right)-x\left(x-y\right)=\left(5-x\right)\left(x-y\right)\)
d)\(4\left(2x-y\right)-x\left(y-2x\right)=-4\left(y-2x\right)-x\left(y-2x\right)=\left(-4-x\right)\left(y-2x\right)\)
e)\(\left(2x+1\right)^2+2\left(2x+1\right)=\left(2x+1\right)\left(2x+1+2\right)=\left(2x+1\right)\left(2x+3\right)\)
f)\(y\left(x+y\right)-y-x=y\left(x+y\right)-\left(x+y\right)=\left(y-1\right)\left(x+y\right)\)
g)\(2y\left(x-y\right)^2+x\left(y-x\right)^2=2y\left(y-x\right)^2+x\left(y-x\right)^2=\left(2y+x\right)\left(y-x\right)^2\)
h)
Tham khảo :
1. Mai is more intelligent than Kien
2. My brother is stronger than my sister
3. Life in the city is more exciting than life in the countryside
4. Doing our homework is more important than reading a novel
5. Ho Chi Minh city is bigger than Ha Noi capital.
6. Mount Everest is the highest all over the world
7. Ba Be lake is the largest in Viet Nam
8. Mekong river is the longest in Viet Nam
9. Uluru is the most beautiful mountain in Australia
10. Lan is the best English in my class
tìm ở ??? mà nhanh ghê