one+two+three+four+five+six+seven+ieght+nine+ten
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sử dụng phép tính nhanh:
=(one + nine)+(two + eight)+(three + seven)+(four + six)+ten+five
=ten+ten+ten+ten+ten+five
=fifty-five
có số số hạng là:
(10 -1) :1 +1= 10
tổng dãy số là:
(10+1) x 10 :2=45
đáp số :45
1. third
2. ninth
3. twentieth
4. sixth
5. twelfth
6. first
7. thirty-first
8. seventeenth
9. second
10. twenty-third
11. fifteenth
12. eighth
13. fifth
14. eleventh
15. twenty-fourth
16. tenth
17. seventh
18. twenty-eighth
19. fifteenth
20. thirteenth
one + four + five + ten + nine + six + seven = thirty seven
theo thử tự nhé: four ; eight ; ten
k nha!
(a)oh nine eight nine two oh three four six eight
(b), (c),(e), (f),(g) và (h) mik thấy sai sai
(d)oh nine eight seven three four seven five double two
01694051970:oh one six nine four oh five one nine seven oh
Có fải bài này trong vở bt tiếng anh 7 ko?
Write the time
1. A quarter to eight :7h45'
2.From half past six to eight o’clock:from 6h30 to 8h
3.From four o’clock to quarter past five :from 4 to 5h15
4.At twelve o’clock :12h
5.At ten past eight:8h10
6.At ten to eight:7h50
7.From quarter past six to s:even o’clock:from 6h15 to 7
8.At five past two:2h5
9.From seven to nine o’clock:from 7 to 9
10.From ten past four to five o’clock:from 4h10 to 5h
11.At five o’clock:5h
12.At half past seven:7h30
13.From five o’clock to half past six :from 5h to 6h30
dịch
one+two+three+four+five+six+seven+ieght+nine+ten
1+2+3+4+5+6+7+8+9=55
one+two+three+four+five+six+seven+ieght+nine+ten=1+2+3+4+5+6+7+8+9+10=55