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Hello! My name is thang. Today I please introduce about oneself. I'm student majoring Korean studies. I'm learning Korean and English. Now I'm 19 old enough to get independent and I'm favourite to watch the TV and read the book but I prefer reading the book to watching the TV. I used to read the comic in the cafe and feel like knowing many new things. Some times I remember reading books, but. I forget it. I'm interested in people thinking about me how. I spend a day studying when leisure I will watch the cartoon. I plan to become a tour guide to go all over the country and also watch all nature beauty of the country. I wish everything would take place according to my will. I'm always watch the sky full of stars alone with longing develop oneself. If I were bird dove I would let oneself in the wind.
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1 + 5 + 9 + 13 + 17 +…. + x =507528
Ta có 5 = 2 + 3; 9 = 4 + 5; 13 = 6 + 7; 17 = 8 + 9…
Suy ra x = a (a + 1) (với a ϵ N)
Nên 1 + 5 + 9 + 13 + 17 +…. + x = 1 + 2 + 3 + 4 + 5 + 6 + 7 + ….+ a (a + 1) =507528
Hay ( a + 1) (a + 1 + 1) : 2 = 1225
( a + 1) (a + 2) = 1225 x 2 = 2450 = 49 x 50
=> a = 48
=> x = 48 x ( 48 + 1 ) = 2352
1 + 5 + 9 + 13 + 17 +…. + x =507528
Ta có 5 = 2 + 3; 9 = 4 + 5; 13 = 6 + 7; 17 = 8 + 9…
Suy ra x = a (a + 1) (với a ϵ N)
Nên 1 + 5 + 9 + 13 + 17 +…. + x = 1 + 2 + 3 + 4 + 5 + 6 + 7 + ….+ a (a + 1) =507528
Hay ( a + 1) (a + 1 + 1) : 2 = 1225
( a + 1) (a + 2) = 1225 x 2 = 2450 = 49 x 50
=> a = 48
=> x = 48 x ( 48 + 1 ) = 2352
Thư chạy quanh hồ mất số giây là:
\(60.\dfrac{1}{4}=15\) (giây)
Quỳnh chạy quanh hồ mất số giây là:
\(60.\dfrac{1}{3}=20\) (giây)
Ta có thế thấy Thư chạy quanh hồ mất 15 giây còn Quỳnh chạy quanh hồ mất 20 giây.
=> Thư chạy nhanh hơn Quỳnh
Thư chạy nhanh hơn Quỳnh số giây là:
20 - 15 = 5 (giây)
Đáp số: 5 giây
Chiều rộng của khu rừng hình chữ nhật đó là:
\(3000\times\dfrac{1}{2}=1500\left(m\right)\)
Diện tích của khu rừng hình chữ nhật đó là:
\(3000\times1500=4500000\left(m^2\right)=450ha\)
She isn't playing volleyball with her brother.
They aren't laughing at the moment.
The girl isn't running.
My dad isn't driving his car.
It isn't snowing now.
We aren't speaking with a foreigner.
Thompson isn't writing in his notebook.
She isn't playing volleyball with her brother.
They aren't laughing at the moment.
The girl isn't running.
My dad isn't driving his car.
It isn't snowing now.
2. ours 3. hers 4. my 5. yours 6. Her
7. your - mine 8. theirs 9. his 10. our - ours
oneself -> myself
19 old->19 years old
oneself => myself
19 old => 19 years old