giúp mik nhá
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Bài 1)
\(\dfrac{9}{12}+\dfrac{10}{12}=\dfrac{12}{19}\)
\(\dfrac{50}{54}=\dfrac{27}{25}\)
\(\dfrac{16}{24}-\dfrac{9}{24}=\dfrac{7}{24}\)
\(\dfrac{8}{5}x\dfrac{4}{3}=\dfrac{32}{15}\)
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Bài 2)
a) \(x=\dfrac{5}{2}-\dfrac{2}{7}\)
\(x=\dfrac{31}{14}\)
b) \(x=\dfrac{6}{7}x\dfrac{4}{5}\)
\(x=\dfrac{24}{35}\)
chọn đáp án A
giải
ta có S hóa trị thường là II nên S2 sẽ có hóa trị là 4
\(\dfrac{2xII}{1}=IV\)
Diện tích hình vuông ABCD là :
30 x 30 = 900 (cm2)
Diện tích hình tam giác BMN là :
30 x 40 : 2 = 60 (cm2)
Diện tích hình đó là :
900 + 60 = 960 (cm2)
Đáp số : 960 cm2
\(\dfrac{2}{3}\left(\dfrac{2}{10}+\dfrac{3}{10}+\dfrac{5}{10}\right)=\dfrac{2}{3}+\dfrac{10}{10}=\dfrac{2}{3}+1=\dfrac{5}{3}\)
nửa chu vi của hình tròn là :
50 x 3,14 : 2 = 78,5 ( m )
Chu vi của sân vận động là :
2 x 78,5 + 2 x 110 = 377 ( m )
Đáp số: 377m.
Chu vi phần hcn là : ( 50 + 110 ) x2 = 320 ( m )
Chi vi phần hình tròn là : 50 x 3,14 = 157 (m )
Chu vi sân vận động là : 320 + 157 = 477 ( m )
Đ/S : ,.................
2. Although Tom was seriously advised by his teacher, he insisted in disturbing the class.
Inspite of being seriously advised by his teacher, Tom insisted in disturbing the class.
3. Although she tried several times, Mary couldn't find a taxi.
Inspite of trying several times, Mary couldn't find a taxi.
4. Despite of feeling tired, he stayed up to keep our company.
5. Inspite of not having much time, they came to visit us.
6. Although he is too old, he still does his gymnass every morning.
Despite of being too old, he still does his gymnass every morning.
7. Inspite of being very expensive, people buy the shirts because they are trendy.
8. Inspite of having no qualification, he got the job.
9. Although I didn't the CD you recommended me, I bought it all the same.
Inspite of not liking the CD you recommended, I bought it all the same.
10. Although I told her the truth, she didn't believe me.
Inspite of telling the truth, she didn't believe me.