eight x two : four + ten - seven = ?
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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
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
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 - two - four - eight - sixteen
ten - eleven - nine - twelve - eight - thirteen - seven
a, one + sixty = sixty one
b, twenty + eleven = thirty one
c, two + seven - four = five
d, five + eight + seven - ten = ten
e, one + no + four = five
f, nine + ten + one = twenty
g, sixty + twenty + ten + ten = one hundred
h, fifty + forty = ninety
i, forty + sixty = one hundred
k, one hundred - fifty = fifty
Mr. vinny has the number of chickens: forty + twenty + fifteen + three seven + fifty = one hundred six two
eight x two : four + ten - seven =8 x 2 : 4 + 10 - 7=16:4+10-7=4+10-7=14-7=7
eight x two : four + ten - seven = sixteen : four +ten - seven
= four + ten - seven = fourteen - seven = seven