one + two + seven + nine = ?
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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
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![](https://rs.olm.vn/images/avt/0.png?1311)
theo thử tự nhé: four ; eight ; ten
k nha!
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nine + ƒive + seven + seven + ƒour + one + nine + one + one =
= 9 + 5 + 7 + 7 + 4 + 1 + 9 + 1 + 1
= 14 + 7 + 7 + 4 + 1 + 9 + 1 + 1
= 21 + 7 + 4 + 1 + 9 + 1 + 1
= 28 + 4 + 1 + 9 + 1 + 1
= 32 + 1 + 9 + 1 + 1
= 33 + 9 + 1 + 1
= 42 + 1 + 1
= 43 + 1
= 44
\(nine+five+seven+seven+four+one+nine+one+one\)
\(=fourty-four\)
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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
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(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?
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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
nineteen nhé
one=1
two=2
seven=7
nine=9
1+2+7+9
=19