Jup e nhé
K
Khách
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Những câu hỏi liên quan
17 tháng 9 2017
7/19 . 8/11 + 3/19 . 7/11 + ( -12/19 )
= 7/19 + 3/19 . 8/11 + 7/11 + ( -12/19 )
= 10/19 . 15/11 + ( -12/19 )
= 15/11 . 10/19 + ( -12/19 )
= 15/11 . ( -2/19 )
= -30/209
TL
21 tháng 5 2022
1. It took me 3 months to accomplish this task
2. Sorting out her stamps take Jane 3 hours a week
3. The picture will take 3 minutes to reach the earth after they are taken
4. It took her 30 minutes to write the letter
5. It took John two hours to finish his essay
6. It took me an hour to wash all these clothes
7. It took three and a half hours to fly to Moscow
8. It took us 5 hours to get to London
9. It took the passengers one hour and a half to fly to Hanoi
10. It took the engineers 100 days to complete the construction work
II.
1. Mary behaved kindly towards me
2. He is fluent in delivering his lecture
3. They were carful in their work
4. Tom was foolish in his action
5. She was blind in her decision
6. We deal with everything
7. He understands the lesson quickly
8. My sister does housework slowly
26 tháng 10 2021
11: \(=x^2-2x+1-x^2+4\)
=-2x+5
13: \(=\left(6x+1-6x+1\right)^2\)
=4
TD
5 tháng 5 2019
7,00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001 điểm
jup e vs mn
13 tháng 2 2022
Bài gần giống b tham khảo nka
1.Although she disliked coffee, she drank it to keep herself warm
2.In spite of Mary’s dislike of flying, she will take a plane
3.Although Marcy was sad because of losing the contest, she managed to smile
4.Despite the cloudy weather, we took many pictures
5.Even though the old woman had a poor memory, she told interesting stories to the children
6.In spite of his being absent frequently, he has managed to pass the test
7.Though Nancy had promised not to tell anyone the secret, she told me that
8.Even though we know we will not win a prize, we plan to buy a ticket for the drawing
9.Even though going to the movies is costly, my daughters insist on doing that every Saturday
10.In spite of his being on a diet, he ate the chocolate cake
5
c)
Ta có :
\(\dfrac{1}{5}+\dfrac{1}{35}+\dfrac{1}{63}+...+\dfrac{1}{143}\)
\(=\dfrac{1}{5}+\dfrac{1}{5}.\dfrac{1}{7}+\dfrac{1}{7}.\dfrac{1}{9}+....+\dfrac{1}{11}.\dfrac{1}{13}\)
\(=\dfrac{1}{2}.\left(\dfrac{1}{10}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+....+\dfrac{1}{11}-\dfrac{1}{13}\right)\)
\(=\dfrac{1}{2}.\left(\dfrac{1}{10}+\dfrac{1}{5}-\dfrac{1}{13}\right)=\dfrac{1}{2}.\dfrac{29}{130}=\dfrac{29}{260}\)
Chúc bạn học tốt =))
d)Tính \(\dfrac{10}{3}+\dfrac{1}{6}\) và \(\dfrac{25}{2}-\dfrac{1}{4}\)
c)\(\dfrac{1}{1\cdot5}+\dfrac{1}{5\cdot7}+...+\dfrac{1}{11\cdot13}\)
Ok tự lm nốt e nhé ! v~