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Những câu hỏi liên quan
NL
Nguyễn Lê Phước Thịnh
CTVHS
1 tháng 8 2021
Câu 1:
Ta có: \(0,1+0,2+...+0,19+0,20\)
\(=\left(0,1+0,2+...+0,10\right)+\left(0,11+0,12+...+0,19+0,20\right)\)
\(=4.6+1.55=6,15\)
NL
Nguyễn Lê Phước Thịnh
CTVHS
12 tháng 8 2021
Bài 2:
Cả mảnh vải dài:
\(25:\dfrac{3}{5}=\dfrac{125}{3}\left(m\right)\)
MN
2
NL
Nguyễn Lê Phước Thịnh
CTVHS
24 tháng 8 2021
\(\left(\dfrac{1}{3}\right)^4:\left(-\dfrac{9}{2}\right)^6\)
\(=\dfrac{1}{3^4}:\dfrac{3^{12}}{2^6}\)
\(=\dfrac{2^6}{3^{16}}\)
NT
8
ne
MN
4
NL
Nguyễn Lê Phước Thịnh
CTVHS
16 tháng 8 2021
a: Ta có: \(\dfrac{n\left(n+1\right)}{2}=231\)
\(\Leftrightarrow n^2+n-462=0\)
\(\Leftrightarrow n^2+22n-21n-462=0\)
\(\Leftrightarrow\left(n+22\right)\left(n-21\right)=0\)
\(\Leftrightarrow n=21\)
KH
3
4. She asked her mum if she knew where her tennis racquet was
5. She asked her secretary if Ha had been at work the previous day
6. She asked him if he had read the title about Price Diana
7. She asked whether they could play the piano
8. He asked if Sarah had ever been to siena
9. Charlie asked whether they were French or Canadian
10.Bob asked if they were going out that night
11. Sarah asked John whether she could use his mobile
12. Luis asked Paul if he had ever been to Lisbon
13.JK asked if the Pope was a Catholic
14. Letizia asked Philip if he had fed the cat.
15.He wondered if Ann always went to church on Sundays
16. I wanted to know how I could solve the problem
18. She asked him if he wanted to go out for a meal
19. She asked me if she could use my phone to make a local call
Lần sau chép đề ra nhé :)