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chiếu một tia sáng tới một gương phẳng ta thu được một tia phản xạ hợp với mặt gương một góc 37.5 độ. Khi đó góc phản xạ có độ lớn bằng bao nhiêu độ
\(\dfrac{3}{4}< \dfrac{9}{x}-3< \dfrac{6}{7}\\ \Leftrightarrow\dfrac{15}{4}< \dfrac{9}{x}< \dfrac{27}{7}\\ \Leftrightarrow\dfrac{4}{15}< \dfrac{x}{9}< \dfrac{7}{27}\\ \Leftrightarrow\dfrac{12}{5}< x< \dfrac{7}{3}\)
Could you bring me a bar of chocolate tomorrow?
You must follow all the road signs
Could you bring a bar of chocolate tomorrow?
You must follow all the road signs
1. won't you?
2. can't you?
3. will you?
4. will you?
5. won't you?
1.I (walk)....was walking........ along the street suddenly I (hear).....heard.......... footsteps behind me.
Somebody (follow)........was following......... me. I was frightened and I (start)......started........ to run.
2. I (be) have been to HCMcity several times
1.I (walk).....was walking....... along the street suddenly I (hear).......heard........ footsteps behind me.
Somebody (follow).........was following........ me. I was frightened and I (start).......started....... to run.
2. I (be) have been to HCMcity several times
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