4!+2.3! =????
6! + 3.4!=????????????
help me , I want to now
K
Khách
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Fuckking for you
O
3 tháng 4 2022
\(S=\dfrac{1}{2\cdot3}+\dfrac{1}{3\cdot4}+\dfrac{1}{4\cdot5}+...+\dfrac{1}{2021+2022}\)
\(S=\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{2021}+\dfrac{1}{2021}-\dfrac{1}{2022}\)
\(S=\dfrac{1}{2}-\dfrac{1}{2022}\)
\(S=\dfrac{1011}{2022}-\dfrac{1}{2022}\)
\(S=\dfrac{505}{1011}\)
26 tháng 10 2021
41. His friends talked him into smoking a cigarette with them, they were peer pressuring him.
42. They pressured you into underage smoking which is dangerous.
43. Peer pressure can even affect the strongest-willed person.
44. G-Dragon should walk away and find a new group of friends.
45. The one who can respect your decisions and help you become a better person.
27 tháng 6 2017
- Nguyễn Thị Thu Chi
- S=1.2+2.3+3.4+.............+n(n+1)
S =1(1+1) + 2(2+1) + 3(3+1) +...+n(n+1)
S =(1^2 + 2^2 + 3^2 +...+ n^2) + (1 + 2 + 3 + ...+ n)
ta có các công thức:
1^2 + 2^2 + 3^2 +...+ n^2 = n(n+1)(2n+1)/6
1 + 2 + 3 + ...+ n = n(n+1)/2
thay vào ta có:
S = n(n+1)(2n+1)/6 + n(n+1)/2
=n(n+1)/2[(2n+1)/3 + 1]
=n(n+1)(n+2)/3
ko chắc chắn lắm
DT
Đỗ Thanh Hải
CTVVIP
7 tháng 6 2021
1 who's => whose
2 he => him
3 to shoul => shouling
4 for => bỏ
5 do => to do
6 have you met => did you meet
7 painted => been painting
8 to wait => waiting
NN
28 tháng 4 2019
Sử dụng If only hoặc Wish bày tỏ ao ước:
1/ My father is not here now. I want him to be here now.
i wish my father were here now
2/ You talk more than you work. The teacher wants you to worrk more than to talk.
the teacher wishes you worked more than to talk
3/ John would like to be an astronaut when he grows up.
john wishes he would be an astronaut when he grows up
4/I am sorry I did not help you yesterday.
i wish i had help you yesterday
5/ I regret that you did not give me a chance to tell you the truth.
i wish you had given me a chance to tell you the truth.
28 tháng 4 2019
1. I wish my father was here now
2. The teacher wishes you worked more than talked
3. John wish he would be an astronaut
4. I wish I had helped you yesterday
5. I wish you had given me a chance to tell you the truth
= 26.683437382
= 730.136101851
Tck mk nhé , thanks ! ^-^
thank you so much