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Ta có: C= \(\frac{3^{99}}{3^{100}}\)+\(\frac{3^{98}}{3^{100}}\)+...+\(\frac{1}{3^{100}}\)
=\(\frac{3^{99}+3^{98}+...+3+1}{3^{100}}\)
=\(\frac{1+3+3^2+...+3^{99}}{3^{100}}\)
=\(\frac{3^{100}-1}{3^{100}}\)
=1
1. Tall - taller - tallest
2. short - shorter - shortest
3. big - bigger - biggest
4. small - smaller - smallest
5. long - longer - longest
6.thick - thicker - thickest
7. high - higher - highest
8. old - older - oldest
Chúc bạn học tốt!
1. Tall-taller-tallest
2. short-shorter-shortest
3. big-bigger-biggest
4. small-smaller-smallest
5. long-longer-longest
6.thick-thicker-thickest
7. high-higher-highest
8. old-older-oldest
You can't tell whether a food is contaminated with E. coli by the way it looks, smells or tastes. Although most types of Escherichia coli (E. coli) bacteria are harmless, certain strains, such as E. coli O157:H7, can cause serious foodborne illness.
To protect yourself from E. coli and other foodborne illnesses, follow basic food safety guidelines:
- Rinse raw produce thoroughly; scrub produce that has a firm surface.
- Wash your hands, utensils and kitchen surfaces with hot, soapy water before and after preparing or eating food.
- Keep raw foods, especially meats, separate from ready-to-eat foods.
- Refrigerate or freeze perishable foods promptly.
- Avoid unpasteurized juices, ciders and dairy products.
- Don't drink untreated water from lakes or streams.
- Cook foods thoroughly. Use a thermometer to verify the temperature.
- Beef, pork, lamb and veal steaks, chops, and roasts should be cooked to a minimum internal temperature of 145 F (63 C) and allowed to rest for 3 minutes before serving.
- Ground meats other than poultry should be cooked to at least 160 F (71 C).
- Poultry should be cooked to 165 F (74 C).
- Leftovers and casseroles should be cooked to 165 F (74 C).
Chủ đề food
The young people‘s experiences suggested that weight loss and keeping a healthy weight required them to change their eating and lifestyle habits.
Lifestyle changes that had helped young people lose weight included:
• Spending less time in front of the TV or computer
• Being more active by walking to school, for example
• Taking regular exercise (see Exercise)
Changes to eating habits that helped included:
• Eating breakfast everyday
• Eating more fruit and vegetables
• Having smaller food portions
• Eating more slowly
• Cutting down or avoiding food high in saturated fat and sugar
• Healthy snacking (like a piece of fruit)Chủ đề healthy
1. My mother goes to the supermarket because she wants some fruit.
2.I and my friends are going to have a party tonight.
3.He doesn't often want to see the movie.
4.Are they wearing the dress now?
M>4/3
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