| 1658 | + | = 1 | |
| 1661 |
K
Khách
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PK
3
NM
NGUYỄN MẠNH HÀ
VIP
9 tháng 3 2023
số trừ = hiệu + số trừ
mà đề bài đã cho tổng hiệu và số trừ là 1658
vậy số trừ là 1658
PT
1
PT
2
LH
23 tháng 4 2017
Coi số gạo nếp là 1 phần bằng nhau thì số gạo tẻ là 5 phần như thế
Số gạo tẻ là :
1658 : ( 5 + 1 ) x 5 = 1381,666667 ( kg )
Đáp số : 1381,666667 kg
PT
1
20 tháng 2 2019
\(\left(a^2+b^2\right)\left(c^2+d^2\right)=4282.1658=7099556\)
\(\Leftrightarrow\left(ac+bd\right)^2+\left(ad-bc\right)^2=7099556\)
Mà ac+bd=2384
⇔\(\left(ad-bc\right)^2\)=7099556−23842=1416100
⇔|ad−bc|=1190
=> ad=bc=1190
AH
Akai Haruma
Giáo viên
20 tháng 6 2019
Lời giải:
Để ý rằng:
\((ac+bd)^2=a^2c^2+b^2d^2+2acbd\)
\(=(a^2+b^2)(c^2+d^2)-a^2d^2-b^2c^2+2adbc\)
\(=(a^2+b^2)(c^2+d^2)-(a^2d^2+b^2c^2-2adbc)\)
\(=(a^2+b^2)(c^2+d^2)-(ad-bc)^2\)
Thay số liệu đề bài ta có:
\(2384^2=4282.1658-F^2\)
\(\Leftrightarrow F^2=1416100\)
\(\Rightarrow F=\pm 1190\)
DT
Đỗ Thanh Hải
CTVVIP
10 tháng 12 2021
1. His first _____ experiment was carried out in 1658.
A. physics B. physician C. physical D. physicist
2. Many wild animals are in _____ of extinction.
A. dangerous B. danger C. endanger D. dangerously
3. It is in this town _____ I was born.
A. where B. which C. that D. in which
4. You hardly ever use the Internet now, _____?
A. are you B. haven’t you C. don’t you D. do you
5. _____ from anything else, she is always late for work.
A. Apart B. As well C. Except D. Not only
6. Mary walked away from the discussion. Otherwise, she _____ something she would regret later.
A. will say B. said C. might say D. might have said
7. The Browns had to use all their _____ to buy their new house.
A. savings B. expenses C. reserves D. remains
8. We all need friends whom we can _____ when we are in trouble.
A. rely on B. carry on C. live on D. go on
9. I had to get up early; _____, I would miss the train.
A. otherwise B. if not C. but D. so that
10. Most young people want to _____ more about environmental problems.
A. look up B. find out C. deal with D. make out
11. Lord Gurney was a very _____ man in the village. Nobody knew who he was.
A. unlike B. impossible C. unpopular D. uninteresting
12. The bus conductor told him to get off because he couldn't pay the _____.
A. fare B. journey C. bill D. travel
13. Let’s _____ a coin to decide which team will kick the ball first.
A. toss B. turn C. twist D. spin
14. At parties people _______ to talk about jobs and money.
A. habit B. accustom C. tend D. keep
15. The sun shines brightly and the water is _____.
A. boiling B. freezing C. melting D. vaporizing
16. The new restaurant is _____ at the corner of a busy street.
A. put B. located C. stood D. placed
17. This one is prettier, but it costs _____ as the other one.
A. as much as B. twice as much C. as many D. twice as many
18. _____ weather! We can't go out for a walk now.
A. How terrible B. What terrible C. How a terrible D. What a terrible
19. Of all the sports he played, _____.
A. he liked tennis least B. tennis was liked least by him
C. it was tennis which was his least liked D. tennis was disliked by him least
20. Bill: The building is nearly finished, isn’t it?
Mary: Yes, but it’ll be _____ we can move in.
A. a long time before B. too much time until
C. hardly time when D. very soon that