2x2 - x - 10 = 0
Help me if you can. Please faster!!!
K
Khách
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KY
18 tháng 12 2021
Old man: Can you please do me a favor? Ba: ...............
A. Yes. Please help me B. Sure. How can I help you?
C. Yes, you can D. No, you can't
Câu 7. The children can look after ............................... for a few days.
A. them B. they C. themself D. themselves
Câu 8. My grandfather used ____________ us to the zoo when he was alive.
A. took B. to take C. taking D. take
Câu 9. Choose the underlined word or phrase in each sentence that needs correcting.
The armchair is in the living-room among the television and the sofa.
A B C D
Câu 10. My hometown is getting more modern and .....................
A. more noisy B. noisier C. noisiest D. more noisier
Câu 11. The water wasn't ____________ in.
A. clear enough for swimming B. enough clear for swimming
C. enough clear to swim D. clear enough to swim
Câu 12. Choose the word that has the underlined part pronounces differently
A. looked B. phoned C. missed D. watched
Câu 13. Don't come in. Pleased wait ____________ for your turn.
A. outside B. inside C. downstairs D. upstairs
Câu 14. We must be there....................7.30 and 10.30.
A. between B. at C. after D. before
Câu 15. His father is very proud ________ him.
A. on B. about C. of D. with
Câu 16. They …………….. in that house for 3 years.
A. have lived B. live C. lived D. are living
Câu 17. Choose the word that has a different stress pattern from the others.
A. plentiful B. generous C. volunteer D. sociable
MV
5
K
22 tháng 5 2020
dùng cấu trúc : Do/would you mind + (not) + doing sth hoặc Would/Do you mind if... ? để viết lại các câu sau cho lịch sự hơn :
1. Please don't smoke
Do/Would you mind not smoking ?
2.can I turn on the tv
Do you mind if I turn on the TV? / Would you mind if I turned on the TV?
3.will you help me carry this box upstairs ?
Do/Would you mind helping me carry this box upstairs ?
4. can you solve this math problem for me ?
Do/Would you mind solving this math problem for me ?
5. can i use your personal computer for some minutes ?
Do you mind if I use your personal computer for some minutes? / Would you mind if I used your personal computer for some minutes?
6.can you show me how to operate this machine ?
Do/Would you mind showing me how to operate this machine ?
7.can i ask you some questions about your family ?
Do you mind if I ask you some questions about your family? / Would you mind if I asked you some questions about your family?
8. May i take a photo of your new house?
Do you mind if I take a photo of your new house? / Would you mind if I took a photo of your new house?
9. will you please take me around the town?
Do/Would you mind taking me around the town ?
10.can i borrow your english dictionary ?
Do you mind if I borrow your English dictionary? / Would you mind if I borrowed your english dictionary?
3 tháng 4 2019
Đáp án: D
Giải thích: Câu nhờ vả: “can you…”: bạn có thể…
Dịch: Bạn có thể giúp tôi bài toán này được không, làm ơn?
AM
3
TL
2 tháng 1 2021
“Can you carry these chairs into the house”
→ Mrs Lan asked me …………………………if i could carry those chairs into the house………………………………….
“Please give me your book.”
→ He told me …………………………to give him my book………………………………………….
“You shouldn’t make noise in class.”
→ The teacher said ………………………that you shouldn't make noise in class……………………………………….
“Can you help Tam with his English pronunciation?”
→ Mr Hung asked me …………………………if i could help Tam with his english pronunciation…………………………………
My hobbies are playing sports and reading books.
→ I love ………………playing sports and reading books…………………………
12 tháng 2 2017
Do n+3\(⋮\)n+3 (*) => (n+3)2\(⋮\)n+3 hay n2+6n+9\(⋮\)n+3
=> n2+6n+9-(n2-7)\(⋮\)n+3 hay 6n+16\(⋮\)n+3
Từ (*) => 6n+18\(⋮\)n+3
=> 6n+18-(6n+16)\(⋮\)n+3 hay 2\(⋮\)n+3
=> n+3 \(\in\){-2;-1;1;2}
Vậy n \(\in\){1;2;4;5}
12 tháng 2 2017
Ta có: \(n^2-7⋮n+3\Leftrightarrow n^2-9+2⋮n+3\Leftrightarrow\left(n-3\right)\left(n+3\right)+2⋮n+3\)
\(\Rightarrow\)\(2⋮n+3\)
Vậy n+3 là Ước của 2
Ta có bảng sau:
| n+3 | 1 | 2 | -1 | -2 |
| n | -2 | -1 | -4 | -5 |
Vậy n=....
AM
1
22 tháng 7 2017
. dùng máy tính là ra mà bạn =))
\(x^2-\left[6^2-\left(8^2-9.7\right)^3-7.5\right]^3=89-102\)
\(x^2\left[36-\left(64-63\right)^3-35\right]^3=-13\)
\(x^2-0^3=-13\)
\(x^2=-13\)( Vô lý)
=> x không xác định
HG
1
\(2x^2-x-10=0\Leftrightarrow2x^2-5x+4x-10=0\)
\(\Leftrightarrow\left(2x-5\right)\left(x+2\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=\frac{5}{2}\\x=-2\end{matrix}\right.\)
Thank you very much!!!