Giúp mik làm câu 7 với
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)
6 The boss promised that none of his co-workers had to work overtime the next month
7 The shop assitant asked the man which jeans I had already tried on
8 The zookeeper told the children not to feed the animals
6. The boss promised ( that ) none of his/her co-workers had to work overtime the following month.
7. The shop assistant asked the man which jeans he had already tried on
8. The zookeeper told the children not to feed the animals
![](https://rs.olm.vn/images/avt/0.png?1311)
a, Áp dụng t/c dtsbn:
\(\dfrac{a}{b}=\dfrac{c}{d}=\dfrac{a+c}{b+d}\)
b, Áp dụng t/c dtsbn:
\(\dfrac{a}{b}=\dfrac{c}{d}=\dfrac{2021a}{2021b}=\dfrac{2021a-c}{2021b-d}\)
c, Ta có \(\dfrac{a}{b}=\dfrac{c}{d}\Rightarrow\left(\dfrac{a}{b}\right)^2=\left(\dfrac{c}{d}\right)^2\)
Áp dụng t/c dtsbn:
\(\left(\dfrac{a}{b}\right)^2=\left(\dfrac{c}{d}\right)^2=\dfrac{a^2}{b^2}=\dfrac{c^2}{d^2}=\dfrac{a^2+c^2}{b^2+d^2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(72-3\left|x\right|=9\)
\(3\left|x\right|=72-9=63\)
\(\left|x\right|=63:3=21\)
\(\Rightarrow x=\pm21\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 3:
a: ĐKXĐ: \(x\ne2\)
b: \(A=\dfrac{\left(x-2\right)^2}{5\left(x-2\right)}=\dfrac{x-2}{5}\)
7. BPTT: Ẩn dụ, liệt kê, nhân hóa.
➩ Tác dụng: Khẳng định sức mạnh của lòng yêu nước, đồng thời thể hiện niềm tự hào về truyền thống quý báu của dân tộc.