S:=0; i:=1;
i<9 (đúng): S:=S+i=0+1=1; i:=i+2=1+2=3
i<9 (đúng): S:=S+i=1+3=4; i:=i+2=3+2=5
i<9 (đúng): S:=S+i=4+5=9; i:=i+2=5+2=7
i<9 (đúng): S:=S+i=9+7=16; i:=i+2=7+2=9
i<9 (sai): kết thúc
Vậy S=16, i=9
Mới vào: S=0; i=1;
Lần 1 (1<9): S=0+1=1; i=1+2=3;
Lần 2 (3<9): S=1+3=4; i=3+2=5;
Lần 3 (5<9): S=4+5=9; i=5+2=7;
Lần 4 (7<9): S=9+7=16; i=7+2=9;
Do 9-9 nên điều kiện i<9 sai
⇒ Kết thúc.
Số lần thực hiện vòng lặp: 4.
S=16;
i=9;
Bài 8: Dũng có 54 viên bi. Dũng cho Bình 4/(6 ) số bi. Cho Minh 2/(9 ) số bi còn lại sau khi cho Bình. Hỏi Dũng cho Bình bao nhiêu viên bi?
Chỉ cần ghi đáp án ,ví dụ 1. aa/bb 2.aa/bb
Câu 5: Hãy chỉ ra nhận xét sai khi quan sát ánh sáng phát ra từ ngọn đèn dây tóc. A. Đó là một chùm sáng phân kì. B. Trong chùm sáng đó có vô số tia sáng. C. Trong chùm sáng đó có các tia sáng riêng biệt. D. Truyền đến mắt ta không phải là một tia sáng đơn lẻ. Câu 10: Vào lúc ánh sáng mặt trời hợp với mặt đất một góc 450 . Người ta thấy bóng một cây cọc trên mặt đất dài 5m. Hỏi cây cọc đó cao bao nhiêu? A. 10m B. 7,5m D. 5,5m C. 5m
Bài 7: Mỗi ngày Hà uống hết 1/(4 ) lít sữa. Mỗi chai sữa chứa 7/(12 ) lít sữa . Hỏi Hà uống bao nhiêu chai sữa trong 1 tuần?
Chứng minh rằng với mọi số tự nhiên a, tồn tại số tự nhiên b sao cho ab+4 là số chính phương.
Cho đoạn thẳng AB bằng 1cm. Lấy M1, M2, M3,..., M2021 lần lượt là trung điểm của AB, AM1, AM2,..., AM2020. So sánh AM1+ AM2+ AM3+...+ AM2020 và AB
Bài 6 : Năm nay tuổi con ít hơn tuổi bố là 35 tuổi và bằng 2/(9 ) tuổi bố . Hỏi 3 năm trước tuổi con là bao nhiêu tuổi?
38. What is the funniest commercial that you have seen? Describe it. 39. What differences can you notice between commercials from 10 or 15 years ago and commercials today?
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POPPY DAY Poppy Day, 11 November, is the day when people in Britain remember the soldiers that died in the First World War (1914 – 1918), the Second World War (1939 – 1945) and all other wars since. The first Poppy Day was in 1921. The First World War had ended three years earlier, but it was still very difficult, even impossible, for ex-soldiers in Britain to find employment. So some of them started making and selling red paper poppies. They gave the money that they raised to ex-soldiers who were disabled or unemployed, and to the families of soldiers who had died. The choice of flower was significant. During the war, the soldiers had noticed poppies growing every year on the battlefields in Belgium and the north of France. A well – known poem from that time, written by a Canadian soldier, begin with the lines: In Flanders* fields the poppies blow Between the crosses, row on row, That mark our place*; … In the days leading up to Poppy Day, about 32 million people in Britain buy and wear small poppies. Some people choose to wear white poppies because they think that white symbolizes peace. Then, at 11 a.m. on 11 November (at the moment when the First World War ended) there’s a two – minute silence. Many people stop and think quietly about the soldiers who died. There are ceremonies at war memorials in towns and villages all over the country. The most important ceremony is in London, when the Queen and the Prime Minister lay wreaths of poppies at the Cenotaph, a monument to soldiers who died in battle. *(Flanders ¬= the north of Belgium; our place = our graves) 36. On 11 November people remember _________________________________. A. soldiers who have died since 1921 B. soldiers who have died C. soldiers who died in the two world wars D. soldiers who have died in wars since 1914 37. Why did ex – soldiers start making poppies? A. Because they couldn’t find a job. B. Because they were disabled. C. Because they didn’t have families. D. Because they were employed. 38. They chose to make poppies because ____________________________. A. they had seen poppies growing on the battlefields. B. a Canadian soldier had written a poem about poppies. C. poppies are popular in Belgium and the north of France. D. poppies symbolize peace 39. On Poppy Day ___________________________ A. 32 million people sell poppies. B. people buy or wear 32 million white poppies. C. people wear red or white poppies. D. people choose only white poppies to wear. 40. During the two – minute silence, people _____________________________. A. walk to a ceremony in their town or village B. stop and think about soldiers who have died. C. think about ceremonies at war memorials all over the country. D. think about the moment the First World War ended. giải thik nx ạ!! em cảm ơn
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