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30 tháng 10 2016
a) Dãy số trên có số số hạng là:
(390-5):5+1=78(số)
Tổng là:
(390+5)x78:2=15405
Đáp số: 15405
b) Dãy trên có số số hạng là:
(100-1):1+1=100(số)
Tổng là:
(100+1)x100:2=5050
Đáp số: 5050
tk nhé
30 tháng 10 2016
a, Dãy số này cách nhau 5 đơn vị
Tổng dãy số trên là :
(5 + 390) x ((390 - 5 ) : 5 + 1) : 2 = 15405
b, Dãy số cách đều nha 1 đơn vị
Tổng dãy số là :
(1 + 100) x ((100 - 1) : 1 + 1) : 2 = 5050
mn giup mk lm bai nay voi a
25 tháng 4 2021
bn nhớ tick cho mình nha
7a
bn ko chụp câu 8
9a
10c
11b
12d
13a
mn giup mk giai bai nay voi a
DT
Đỗ Thanh Hải
CTVVIP
12 tháng 5 2021
1 plays
2 are reading
3 sing
4 do - do, help
5 is teaching
7 visited
8 doesn't like
9 watch
10 gets - has - brushes - goes - has
11 played - was
12 met
13 are going to have
14 did - do , planted
15 didn't come
16 paint
17 taught
18 have never been
19 takes
20 have - had
21 received
22 is going to invite
23 is waiting
24 talked
25 is going to travel
26 went - didn't buy
27 doesn't learn - will fail
28 washes
29 will be - watches
30 will phone
PT
12 tháng 5 2021
2 are reading
3 sings
4 do - do - help
5 is teaching
7 visited
8 doesn't like
9 watch
10 gets - has
6. 10 brushes - goes
6. 30 has
11 played - was
12 met
13 will have
14 did - do - planted
15 didn't come
16 paint
17 taught
1 tháng 3 2017
1.The stomachache prevented Mr.Thanh from enjoying the meal.
2.Mrs.Oanh is a good cook.
3.You don't have to finish all the work today.
4.He drives slower and more careful than I do.
5.It takes the boy 3 hours a day to learn the lesson.
6.He liked oranges than durians.
7.One of the greatest football player in the world is Zidane.
8.Why were you absent from class last Monday?
9.The exam was not difficult as we thought.
10.The visitor spoke too quick for me to understand what he said.
7 tháng 5 2019
8x = 7,8x + 25
8x - 7,8x = 25
(8 - 7,8)x = 25
0,2x = 25
x = 25 : 0,2
x = 125
MN
7 tháng 5 2019
\(\frac{3}{x+5}=15\%\)
\(\frac{3}{x+5}=\frac{15}{100}\)
\(\frac{3}{x+5}=\frac{3}{20}\)
\(\Rightarrow x+5=20\)
\(\Rightarrow x=20-5\)
\(\Rightarrow x=15\)
~ Thiên mã ~
7 tháng 5 2019
\(\frac{3}{x}+5=15\%\)
\(\frac{3}{x}+5=\frac{3}{20}\)
\(\frac{3}{x}=\frac{3}{20}-5\)
\(\frac{3}{x}=\frac{-97}{20}\)
\(\Rightarrow\left(-97\right)x=3.20\)
\(\Rightarrow\left(-97\right)x=60\)
\(\Rightarrow x=60:\left(-97\right)\)
\(\Rightarrow x=\frac{-60}{97}\)
~ Hok tốt ~
A
1. rises / is rising
2. will go
3. did you spend
4. doesn't rain
5. goes
6. was / received
7. is / has / wears
8. is reading / reads
9. called / wasn't / took
10. will phone
11. were / lived
12. am going to visit
13.am reading / will lend
14. is going to rain
15. is coming / has
16. have you known / knew
17. Have you ever bited / bited
18. haven't seen / are
19. hasn't finished
20. will be
21. have lived
22. haven't seen
23. will be
24. have been
25. knew
26. won't go / will stay
27. Does the film begin
28. went
29. will the next train leave
30. hasn't visited / moves
31. Do you speak
32. gets
33. are going to have
B
1. is sleeping
2. sets
3. goes
4. doesn't rain
5. are having
6. drinks
7. returns
8. is writing
9. is coming
10. moves
11. smells