Among the Primary 5 students who took part in the final examination, 38 of them scored distinction for Mathematics. 80 students scored distinction for English, 47 of them scored distinction for both subjects and 74 students did not get distinction for either subject. How big was the cohort of Primary 5 students ?
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I call the number of students didn't take part in Mathemas Competition in class A & B are a & b respectively
(with condition: a & b \(\in\)N*)
,From the theme, we have: \(\frac{1}{3}b+a=\frac{1}{5}a+b\)(Because rhe number of students in 2 class is the same)
\(\Leftrightarrow\frac{b}{3}-b+a-\frac{a}{5}=0\Leftrightarrow\left(-\frac{2b}{3}\right)+\frac{4a}{5}=0\)
\(\Leftrightarrow\frac{4a}{5}-\frac{2b}{3}=0\Leftrightarrow\frac{12a-10b}{15}=0\Leftrightarrow12a=10b\)
\(\Rightarrow\frac{a}{b}=\frac{10}{12}=\frac{5}{6}\)
So the ratio of the number of student didn't take part of Class A & B is \(\frac{5}{6}.\)
Câu 2: Read the passage then answer the questions on 16. (Hãy đọc đoạn văn vàjtrả lời những câu hỏi.)
Psychologists at Brunel University in London say that certain types of music help people to. get į started and also to exercise for a long time. People who listen to music, exercise for 13 percent longer than people who don't. International athletes óften listen to music when they are training. Doctors know about ithe therapeutic effects of music. Listening to music can help people recover after operations. Teachers should pay attention, too. In a study at the University of California, students who took a test while listening to a Mozart sonata scored 30 percent higher than students who took the test in silence: Music also relaxes people after a stressful day. Paulin' Etkin, director of. a music therapy center in London, says that throughout. life's ups and downs, people always respond to music. When someone is nervous or afraid,. it can make them feel better. "Music rhythm is closely linked with the rhythms of the body", she says.
Answer the questions:
1. Who say music can help people do the exercise for a long time?
… It's Psychologists at Brunel University in London
2. Do doctors think about the effects of music for therapy?
…Yes, they do
3. What did the University of California do to know about the efeCt of music in school?
…The University of Califotnia made a study to know about the effect of music in school
4. Can music relax people after a stressful day?
…Yes, it can
5. What did Paulin Etkin say?
… "Music rhythm is closely linked with the rhythms of the body", she said
một cuộc khảo sát được tiến hành trên 100 học sinh vào đầu năm. kết quả như sau: 56 sinh viên thích toán, 38 sinh viên thích tiếng anh, 52 sinh viên thích khoa học, 6 sinh viên thích cả toán và tiếng anh, 4 sinh viên thích cả tiếng anh và khoa học, 12 sinh viên thích cả ba môn học. bao nhiêu sinh viên thích cả toán và khoa học, có bao nhiêu sinh viên chỉ thích toán học
tables
corporation
based on
published
total
Mother
three/ double
venom
1. tables
2. corporation
3. based on
4. produced
5. total
6. Mother
7. three ; double
8.sting
Đáp án B
Giải thích: cần 1 động từ số ít cho chủ ngữ “technology”
Dịch: Có một chút bằng chứng rằng công nghệ, khi được dùng đúng cách, giúp học sinh học tập.
Đáp án A
Giải thích: cấu trúc so sánh hơn với tính từ ngắn “be + adj + đuôi –er + than”
Dịch: Ví dụ, một nghiên cứu cho thấy một lớp học y có ipad đạt điểm kiểm tra cao hơn 23% lớp học thường.
Tôi tịt