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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 \(\frac{5}{6}.\)
1.walking in the park seems to be a great idea 2.i studied two languages when i was at high school 3. how long did the tv station broadcast the program ? 4.they should put a chair between the table and the sofa 5. we have biology lessons twice a week
1.Walking in the park seems to be a great idear.
2.I studied two languages when I was at high school.
3.How long did the TV station broadcast the program?
4.They should put a chair between the table and the sofa.
5.We have Biology lessons twice a week.
6.Why does Mr.iohn worry about his son's study?
7.I went to the movies to see a film last night.
8.Is his date of birth is the eightn of November?
9.Why does Philip want to be an engineer?
10.She never buys cabbages and potatoes at the market.
11. Ha live with his brother at 45 Tran Hung Dao street in Ha Noi .
12.The public library in the city has 1 thousands of book .
13.Would you mind sitting in the front seat of the taxi?(không chắc chắn)
14.Quan is very good at natural sciences.
15.It's a short walk from here to the supermarket.
16.Are you scared of seeing the dentist?
17.What school activities do you often take part in?
18.There was a souvenir shop near the sxit or aquarium .
19.I came to the party with a friend of mine.
20.Hoa is measuring her height and weighing on the scale at the moment.
21.The people in Asia often drink tea.
22.He has a long face and a straight nose.
23.How glad I am to see you again?(không chắc chắn)
SAI THÌ THÔI NHA!^^
1-d
2-c
3-b
4-b
5-b