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\(300000\times7+600000\)
\(=300000\times7+300000\times2\)
\(=300000\times\left(7+2\right)\)
\(=300000\times9\)
\(=2700000\)

Bởi vì: Ở nấm không tồn tại chất diệp lục và cũng không diễn ra quá trình quang hợp như những loài thực vật khác. Vách tế bào của nấm được cấu tạo bởi Glucan và Chitin khác với Xenlulose ở thực vật.

__Where____ did you go last night? -I visited my grandfather's house
___Where___ did you go last night? -I visited my grandfather's house

c1. I woke ___up___ late this morning and missed the first bus to school.
2. Can you turn _____on_ the lights? It's too dark to see anything.
3. We need to give ___back___ the books to the library before they charge us.
4. She looked ___after___ her younger brother while her parents went to the grocery store.
5. He decided to give ___up___ eating junk food to stay healthy and feel better.
6. They set ___off___ early to reach the beach before it became crowded with tourists.
7. I always take ___off___ my shoes when I enter someone's home as a courtesy.
8. The car broke down on the highway, so we had to call __for____ help.
9. She ran __into____ her old school friend at the shopping mall last weekend.
10. Please fill ___in___ this form before submitting your application for the library card.
11. The teacher asked us to write ___down___ all the important points during the lesson.
12. I don't know how to deal ___with___ this situation. It's really complicated for me.
13. We put ___on___ warm jackets because it was freezing cold outside that afternoon.
14. He always looks ___up___ __to____ his grandfather because of his wisdom and kindness.
15. The fire alarm went off when someone tried to light __up____ a cigarette indoors.
16. She asked me to pick ____up__ the package from the post office on my way.
17. They told us to keep ____out__ of the construction site because it was dangerous.
18. Can you check ___out___ this new book from the library? It's very popular.
19. We need to hurry ____up__ if we want to catch the last train tonight.
20. She put ___off___ her plans to travel because of the sudden change in weather.