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B
1 Tyler is excited because e is planning to visit the rainforest
2 Children usually get money in red envelop as a present from their parents
3 I don't think John will go fishing with us
4 What did they do when they were in Ha Noi last week?
5 My parents didn't see any monuments at that ancient site 2 years ago
6 When we were on Phu Quoc island, we stayed at a small hotel
C
1 You must switch off your mobile phones during the exam
2 Amanda is going to Bali next summer
3 There weren't many visitors at this landmark ten years ago
4 We are going to play basketball at the weekend
5 Campers don't have to pack a first aid kit
6 Because it's raining heavily, we are staying at home

\(A=\dfrac{5\cdot\left(2^2\cdot3^2\right)^9\cdot\left(2^2\right)^6-2\cdot\left(2^2\cdot3\right)^{14}\cdot3^4}{5\cdot2^{28}\cdot3^{18}-7\cdot2^{29}\cdot3^{18}}\)
\(=\dfrac{5\cdot2^{18}\cdot3^{18}\cdot2^{12}-2\cdot2^{28}\cdot3^{14}\cdot3^4}{5\cdot2^{28}\cdot3^{18}-7\cdot2^{29}\cdot3^{18}}\)
\(=\dfrac{2^{29}\cdot3^{18}\left(5\cdot2-1\right)}{2^{28}\cdot3^{18}\left(5-7\cdot2\right)}\)
\(=\dfrac{2\cdot9}{-9}=-2\)


Nguồn điện → Bộ phận điều khiển → Bộ phận sinh nhiệt → Nồi nấu

- \(\dfrac{1}{9}\) \(\times\) (- \(\dfrac{3}{5}\)) + \(\dfrac{5}{-6}\) \(\times\) (- \(\dfrac{3}{5}\)) - \(\dfrac{7}{2}\) \(\times\) \(\dfrac{3}{5}\)
= ( - \(\dfrac{3}{5}\)) \(\times\) (- \(\dfrac{1}{9}\) - \(\dfrac{5}{6}\) + \(\dfrac{7}{2}\))
= - \(\dfrac{3}{5}\) \(\times\) (- \(\dfrac{17}{18}\) + \(\dfrac{7}{2}\))
= - \(\dfrac{3}{5}\) \(\times\) \(\dfrac{23}{9}\)
= - \(\dfrac{23}{15}\)
