thirty - eight +ten : five - one = ?
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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
one+thirty+ten x forty -five - nine=...
1+30+10x40-5-9=417
Ok....
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
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
thirty - eight + ten : five - one = 30 - 8 + 10 : 5 - 1 = 22 + 2 - 1 = 23 = twenty-three