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Từ \(x+y=700\) \(\Leftrightarrow x=700-y\), thay vào pt (2), ta có:
\(170000\left(700-y\right)=180000y\) \(\Leftrightarrow119000000-170000y=180000y\) \(\Leftrightarrow350000y=119000000\) \(\Leftrightarrow y=\frac{119000000}{350000}=340\) Khi đó, \(x=700-340=360\) Vậy \(\left\{{}\begin{matrix}x=360\\y=340\end{matrix}\right.\)
nếu thấy cm ngược lại thì bạn suy ngược lên đi =))))
III. Choose the correct words to complete the sentences
1. The river is dangerous. You.......... swim here.
A. can
B. can't
C. must
D. mustn't
2. London is a big city, but Tokyo is.......... than London.
A. the biggest
B. biggest
C. bigger
D. big
3. You must not.......... alone.
A. travel
B. travelling
C. to travel
D. travels
4. What.......... the weather.......... ? - It's cool.
A. is/ like
B. does/ like
C. are/ like
D. do/ like
5. .......... Geography Club.
A. Welcome
B. Well come
C. Welcome to
D. Well come to
6. I' m going to introduce some.......... wonders of the world to you.
A. nature
B. natural
C. naturally
D. nation
7. Which country.......... Phuc.......... ?
A. Would/ like visiting
B. Would/ like visit
C. Would/ like to visit
D. Would/ like to visits
8. My mother......... in the kitchen now.
A. is cooking
B. cooks
C. will cook
D. all are correct
9. .......... can I get there?
A. What
B. Where
C. How
D. Who
10. She often.......... dinner at 7 pm, and now she.......... dinner.
A. is having/ is having
B. has/ has
C. has/ is having
D. is having/ has
Giúp mình giải câu này nếu đề sai thì nhớ nhắc mình:
Sit down everybody. The film is ____ to start.
A.ready for B.coming to C.about to D.already
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