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2 năm trước
Cho đường tròn (O, R) ,dây AB bé hơn 2R. Một điểm C ở ngoài đường tròn (O) và nằm trên tia AB. Từ điểm chính giữa E của cung tròn lớn AB kẻ đường kính EF cắt dây AB tại D. Tia CE cắt (O) tại I. Các dây AB cắt nhau tại K. Chứng minh rằng tứ giác EDKI nội tiếp. chứng minh BIC= ABE. Chứng minh CI .CE= CK.CD
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Read the text carefully, then answer the questions: British strange food habits Perhaps you know abot some of the food that British people eat, but do you know about their strange food habits?People from different parts of the UK and from different classes call thier meals by different different names.They call the midday meal, lunch or dinner and the evening meal, dinner,supper or tea.Tea is also sandwiches,cakes or tea(the drink) at four or five o'clock.What do the British eat when they want something quick and easy?Baked beans,of course!You must warm them in a pan and eat them on toast Cheddar cheese is so popular in Britain that people run after it down a hill!This is a very strange English aport.You can see it once a year in Coopers Hill.There are four races, three for men and one for women.At the start of the race someone drops a big, round cheese down a very,very steep hill.About 15 racers run and jump after it.The first person to get to the bottom of the hill gets the cheese There is another strange race that the British have.It is a special Pancake Day race.Only women can run in the race.They must run with a pancake in a frying pan and throw it in the air three times.After the race, many English families eat pancakes with lemon juice and sugar Be careful if you have Christmas dinner with a British gfamily-some of their Christmas customs are risky!Be very careful!Eat the Christmas pudding slowly if you don't want to eat a coin!When they are making their delicious dessert,British people put a coin in the mixture.The person who finds the coin in their pudding will be rich and happy 1.What do the British call the evening meal? -> 2.What do the British have with baked beans? -> 3.How often is the Cheddar cheese sport event held? -> 4.What is the prize if you win the Cheddar cheese race? -> 5.Who can take part in a pancake race? -> 6.Why is it dangerous to eat Christmas pudding? ->

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