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Những câu hỏi liên quan
P
2
TA
1
14 tháng 12 2016
Chỉ khi x + y + z = 0 mới như vậy.
Cụ thể :
Ta có :
\(x^3+y^3+z^3-3xyz\)
\(=\left(x+y\right)^3+z^3-3xy^2-3x^2y-3xyz\)
\(=\left(x+y+z\right)\left[\left(x+y\right)^2+z^2-\left(x+y\right)z\right]-3xy\left(x+y+z\right)\)
\(=\left(x+y+z\right)\left[x^2+y^2+2xy+z^2-xz-yz-3xy\right]\)
\(=0\) là BS xyz
CA
18 tháng 10 2018
(=) 2x.24+2x=34
(=) 2x.(16+1)=34
(=) 2x.17 =34
(=) 2x =2
=) x = 1
vậy.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................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18 tháng 10 2018
Các số từ 1 đến 9 có 9 chữ số.
Các số từ 10 đến 99 có 90 số và có số chữ số là: 90 x 2 = 180 chữ số
Số 100 có 3 chữ số nên sẽ cần số chữ số là: 9 + 180 + 3 = 192 chữ số
Đáp số: 192 chữ số
Chúc bạn học tốt!
17 tháng 2 2019
kiếm nhiều điểm hỏi đáp ... mỗi tội ... con người nói chuyện hơi tục !!!
TT
2
TT
2
DT
Đỗ Thanh Hải
CTVVIP
25 tháng 5 2021
Đề dài thế này sao giải thích nhanh cho e đc
Part 1
1 C
2 B
3 D
4 C
5 B
6 A
Part 2
1 T
2 F
3 F
4 F
V
1 That old house has just been bought
2 If he doesn't take these pills, he won't be better
3 I suggest taking a train
4 Spending the weekend in the countryside is very wonderful
19 tháng 12 2021
\(b,\Leftrightarrow\left\{{}\begin{matrix}m-4=1\\m-1\ne3\end{matrix}\right.\Leftrightarrow m=5\\ c,\Leftrightarrow A\left(3;0\right)\in\left(d_2\right)\Leftrightarrow3m-12+m-1=0\Leftrightarrow m=\dfrac{13}{4}\\ d,\text{PT giao Ox và Oy: }\left\{{}\begin{matrix}y=0\Leftrightarrow x=\dfrac{1-m}{m-4}\Leftrightarrow OA=\left|\dfrac{m-1}{m-4}\right|\\x=0\Leftrightarrow y=m-1\Leftrightarrow OB=\left|m-1\right|\end{matrix}\right.\\ \text{Kẻ }OH\perp\left(d\right)\Leftrightarrow\dfrac{1}{OH^2}=\dfrac{1}{OA^2}+\dfrac{1}{OB^2}=\dfrac{\left(m-4\right)^2}{\left(m-1\right)^2}+\dfrac{1}{\left(m-1\right)^2}\\ \text{Đặt }OH^2=t\Leftrightarrow\dfrac{1}{t}=\dfrac{m^2-8m+17}{m^2-2m+1}\\ \Leftrightarrow m^2t-8mt+17t=m^2-2m+1\\ \Leftrightarrow m^2\left(t-1\right)-2m\left(4t-1\right)+17t-1=0\\ \Leftrightarrow\Delta'=\left(4t-1\right)^2-\left(t-1\right)\left(17t-1\right)\ge0\\ \Leftrightarrow-t^2+10t\ge0\Leftrightarrow0\le t\le10\\ \Leftrightarrow OH_{max}=\sqrt{10}\Leftrightarrow\dfrac{m^2-2m+1}{m^2-8m+17}=10\Leftrightarrow...\)
HN
16 tháng 11 2021
Câu 5: Thể tích của khối chóp đã cho: V = 1/3.2a2.2a = 4/3.a3. Chọn C.
Câu 6: Thể tích của khối chóp đã cho: V = 1/3.32.2 = 6. Chọn A.
Câu 7: Thể tích của khối chóp S.ABC: V = 1/3.1/2.a2.h = 5a3 ⇒ h = 30a. Chọn B.
I.
1. bill - H
2. bulb - F
3. converse - J
4. safeguard - G
5. category - B
6. innovation - A
7. infrastructure - I
8. plumber - C
9. ultimately - D
10. solar - E
II.
1. Washing machines and irons are electrical appliances.
2. It is important to converse energy
3. Remember to put some address labels on the suitcases.
4. More and more money is needed to maintain the city's infrastructure.
5. She got through her work with speed and efficiency
6. The plumber is coming tomorrow to install the new washing machine.
7. Britain produces 20 million tons of nuclear waste each year.
8. There have been recent innovations in steel-making technology.
9. The department needs three more computers in order to work most effectively.
10. The government is having difficulty finding a safe depository for household waste.
III.
1. categorized
2. energetic
3. unprofitable