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dinhthithanhtu04
2 năm trước
Bài 3. Rút gọn biểu thức a. (a+1)^2 - (a-1)^2 - 3(a+1) (a-1) b. (m^3-m+1)^2 + (m^2-3)^2 - 2(m^2-3)(m+1) Làm rõ từng bước
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I. Read the text and answer the questions Health and hygiene are very important .So Nam always takes care of his health .He does morning exercise regularly and eats moderately .He brushes his teeth after meals everyday .He doesn’t eat candy at night .Nam doesn’t stay up late .He often goes to bed at 10 o’clock and gets up at 6 o’clock. He likes watching cartoons but he never sits near TV. It is not good for his eyes. He will always keep his teeth clean and his body fit. Health is more important than anything else! 1. Why does Nam take care of his teeth? ............................................................................................. 2. What does he do after meals? .............................................................................................. 3.What doesn’t he eat at night? ................................................................................................ 4. What time does he sleep? .................................................................................................. 5. Why does he never sit near TV? ..................................................................................................

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