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NT
1
HP
30 tháng 12 2015
a ,
M = 1 + 2 + 22 + ... + 299
= ( 1 + 2 ) + ( 22 + 23 ) + ... + ( 298 + 299 )
= 1 . 3 + 22 ( 1 + 2 ) + ... + 298 ( 1 + 2 )
= 1 . 3 + 22 . 3 + .... + 298 . 3
= 3 ( 1 + ... + 298 ) chia hết cho 3
câu b !? là sao
PT
8 tháng 8 2017
a) =\(\frac{57}{100}+\frac{17}{15}.\frac{25}{68}-\frac{1141}{500}\)
= \(\frac{57}{100}+\frac{1}{3}.\frac{5}{4}-\frac{1141}{500}\)
= \(\frac{57}{100}+\frac{5}{12}-\frac{1141}{500}\)
= -\(\frac{1943}{1500}\)
"." là nhân
PT
8 tháng 8 2017
b) = \(\frac{28}{15}.\frac{3}{4}-\left(\frac{8}{15}+\frac{1}{4}\right).\frac{21}{47}\)
= \(\frac{7}{5}-\frac{47}{60}.\frac{21}{47}\)
= \(\frac{7}{5}-\frac{7}{20}\)
= \(\frac{28}{20}-\frac{7}{20}\)
= \(\frac{21}{20}\)
K nhé
II. Choose the best answer (A, B, C or D)
1. D
2. D
3. C
4. A
5. B
6. B
7. A
8. B
9. D
10. A
III. Use the words and write comparison.
2. Scotland is colder than Athens.
3. Chinese is more difficult than English.
4. Jennifer Lopez is prettier than Madonna.
5. Football is better than volleyball.
6. A novel is longer than a short story.
IV. Complete the following sentences with the comparative form of the adjectives in brackets.
1. more modern
2. more boring
3. busier
4. bigger
5. more interesting
6. noisier
7. more expensive
8. cheaper
9. more comfortable
10. more beautiful
11. more intelligent
12. longer
13. larger
14. stronger
15. more difficult
16. heavier
17. more important
18. worse
19. better
20. prettier