\(75\cdot\left(x-3\right)=150\)
\(\xrightarrow[]{}x-3=150:75\)
\(\xrightarrow[]{}x-3=2\)
\(\xrightarrow[]{}x=2+3\)
\(\xrightarrow[]{}x=5\)

(-) She doesn't get up early in the morning.
(?) Does she often get up early in the morning?

(-) They don't have Math on Monday and Tuesday.
(?) Do they have Math on Monday and Tuesday?

(-) My sister isn't learning English at the moment.
(?) Is your sister learning English at the moment?

(-) We aren't visiting our old teacher this weekend.
(?) Are you visiting your old teacher this weekend?

3/ takes
4/ zorbing
5. models

\(27^4\cdot9^3\)
\(=\left(3^3\right)^4\cdot\left(3^2\right)^3\)
\(=3^{12}\cdot3^6\)
\(=3^{18}\)

* \(\left(a^b\right)^c=a^{b\cdot c}\)

C
D

Dylan's favourite hobby is making vlogs.

Huong is a student in class 7A at Quang Trung school. Collecting glass bottles is one of her favourite hobbies. She started her hobby when she was ten years old. She often shares her hobby with her sister. She finds the hobby interesting and useful. She feels happy when she looks at the beautiful flower vases. She will continue the hobby in the future because it helps save the environment.

c chỉ rõ là ai đi, nhỡ lại có e :((