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6 tháng 3 2020

\(\left(x-2\right)^{2012}+\left|y^2-9\right|^{2014}=0\)

\(\left(x-2\right)^{2012}\ge0;\left|y^2-9\right|^{2014}\ge0\)

\(\Rightarrow\hept{\begin{cases}x-2=0\\y^2-9=0\Rightarrow y^2=9\end{cases}}\)

\(\Rightarrow\hept{\begin{cases}x=2\\y=\pm3\end{cases}}\)

6 tháng 3 2020

Ta có (x-2)2012 >= 0 với mọi x

          Iy2-9I2014 >=0 với mọi y

Mà (x-2)2012+Iy2-9I2014=0

=> (x-2)2012=0 và Iy2-9I2014=0

<=> x-2=0 và y2-9=0

<=> x=2 và y={-3;3}

6 tháng 3 2020

1. I always feel .... nervous.... before examinations ( nervous/ nervously ) 

2. He speaks English ...fluently... ( fluent/ fluently

3. It is an ... interesting... book ( interesting/ interestingly ) 

4. He drove..careless...and he had an accident ( careless/ carelessly ) 

5. we didn't go out because it was raining.. heavily....( heavy/ heavily

6. The football match was very.... exciting.....i enjoyed it ( exciting/ excitingly) 

7. She tried on the dress and it fitted her..well ..... ( good/ well

8. He never has accidents because he always drives...carefully......( careful/ carefully

9. He behaved..stricly ...to wards his children ( strict/ stricly

10. It's too dark to see....clearly...( clear/ clearly)

# HOK TỐT #

6 tháng 3 2020

1. nervous

2.fluently

3.interesting

4.carelessly

5.heavily

6. exciting

7.well

8.carefully

9. strict

10.clear

6 tháng 3 2020

\(A=\frac{\left|x-2017\right|+2018}{\left|x-2017\right|+2019}\)

\(A=\frac{\left|x-2017\right|+2019-1}{\left|x-2017\right|+2019}\)

\(A=1-\frac{1}{\left|x-2017\right|+2019}\)

A nhỏ nhất khi \(1-\frac{1}{\left|x-2017\right|+2019}\)nhỏ nhất

khi \(\frac{1}{\left|x-2017\right|+2019}\)lớn nhất

khi \(\left|x-2017\right|+2019\)nhỏ nhất

mà |x - 2017| \(\ge0\)

=> |x - 2017| + 2019 \(\ge2019\)

Vậy A nhỏ nhất khi A = 2019 khi x - 2017 = 0 => x = 2017

6 tháng 3 2020

\(A=\frac{\backslash x-2017\backslash+2018}{\backslash x-2017\backslash+2019}\) 

\(A=\frac{2018}{2019}\)

6 tháng 3 2020

Nội dung: Là những suy tư của người mẹ trước ngày con vào lớp Một. Qua đó, thể hiện tình cảm yêu thương sâu sắc của mẹ. Đồng thời văn bản nêu lên vai trò to lớn của nhà trường đối với cuộc sống mỗi con người.

6 tháng 3 2020

Là những suy tư của người mẹ trước ngày con vào lớp Một. Qua đó, thể hiện tình cảm yêu thương sâu sắc của mẹ. Đồng thời văn bản nêu lên vai trò to lớn của nhà trường đối với cuộc sống mỗi con người.

6 tháng 3 2020

=1.4.2.5.....98.101/2.3.3.4.....99.100

=(1.2.3.....97.98)(4.5.....100.101)/(2.3.....99)(3.4.....100)

=1.101/99.3

=101/297

7 tháng 3 2020

Bạn tuấn anh có thể giải thích rõ cho mik vì sao bạn có thể ra dược bước 1ko?

6 tháng 3 2020

1 Despite the traffic jam, we (?) managed to arrive at the train station on time

2 In spite of / Despite having enough money, i don't want to buy a new computer

3 In spite of living near the school, both of them usually go to school late

4 In spite of the sickness, my brother still went to school yesterday

5 Despite healthy looking, he has a weak heart 

                 Bạn làm ơn k mik đc ko? Thanks ^^

6 tháng 3 2020

Câu b, c, thôi cx được ạ

Do you know a mouse which typically wears red shorts, large yellow shoes,a nd white gloves? Yes, it mustbe Mickey Mouse, one of the world’s most recognizable characters. He was created by Walt Disney andUb Iwerks at the Walt Disney Studios in 1928 and has been the official mascot of the Walt DisneyCompany. Mickey often appears alongside his girlfriend Minnie Mouse, his pet dog Pluto, his friendDonald Duck and Goofy, and his nemesis Pete.Mickey officially made its first public appearance in...
Đọc tiếp

Do you know a mouse which typically wears red shorts, large yellow shoes,a nd white gloves? Yes, it must
be Mickey Mouse, one of the world’s most recognizable characters. He was created by Walt Disney and
Ub Iwerks at the Walt Disney Studios in 1928 and has been the official mascot of the Walt Disney
Company. Mickey often appears alongside his girlfriend Minnie Mouse, his pet dog Pluto, his friend
Donald Duck and Goofy, and his nemesis Pete.
Mickey officially made its first public appearance in the short film Steamboat Willie (1928). It was one of
the first sound cartoons. He went on to appear in over 130 films, including The Band Concert (1935),
Brave Little Tailor (1938). Mickey appeared mostly in short films, but also occasionally in feature-length
films. Ten of Mickey’s cartoons were nominated for the Academy Award Best Animated Short Film. One
of these cartoons, Lend a Paw, won the ward in 1942. In 1978, Mickey became the first cartoon character
to have a star on the Hollywood Walk of Fame.
1. What does Micket Mouse typically wear?
A. red shorts B. large yellow shoes,a nd white gloves C. both A and B
2. What is the official mascot of the Walt Disney Company?
A. Walt Disney B. Ub Iwerks C. Mickey
3. When did Mickey officially debut?
A. 1928 B. 1935 C. 1938
4. How many Mickey’s cartoons won the Academy Award for Best Animated Short Film?
A. ten B. one C. none
5. When did Mickey become the first cartoon character to have a star on the Hollywood Walk of Fame?
A. 1938 B. 1940 C. 1978

1
9 tháng 3 2020

Do you know a mouse which typically wears red shorts, large yellow shoes,a nd white gloves? Yes, it must
be Mickey Mouse, one of the world’s most recognizable characters. He was created by Walt Disney and
Ub Iwerks at the Walt Disney Studios in 1928 and has been the official mascot of the Walt Disney
Company. Mickey often appears alongside his girlfriend Minnie Mouse, his pet dog Pluto, his friend
Donald Duck and Goofy, and his nemesis Pete.
Mickey officially made its first public appearance in the short film Steamboat Willie (1928). It was one of
the first sound cartoons. He went on to appear in over 130 films, including The Band Concert (1935),
Brave Little Tailor (1938). Mickey appeared mostly in short films, but also occasionally in feature-length
films. Ten of Mickey’s cartoons were nominated for the Academy Award Best Animated Short Film. One
of these cartoons, Lend a Paw, won the ward in 1942. In 1978, Mickey became the first cartoon character
to have a star on the Hollywood Walk of Fame.
1. What does Micket Mouse typically wear?
A. red shorts B. large yellow shoes,a nd white gloves C. both A and B
2. What is the official mascot of the Walt Disney Company?
A. Walt Disney B. Ub Iwerks C. Mickey
3. When did Mickey officially debut?
A. 1928 B. 1935 C. 1938
4. How many Mickey’s cartoons won the Academy Award for Best Animated Short Film?
A. ten B. one C. none
5. When did Mickey become the first cartoon character to have a star on the Hollywood Walk of Fame?
A. 1938 B. 1940 C. 1978

Tôi là một người thích nghe nhạc. Nghe nhạc sẽ giúp tôi cảm

thấy sảng khoái, dễ chịu trong những lúc mệt mỏi, làm việc quá

sức, trong khi nghe nhạc cũng giúp chúng ta học được rất nhiều

điều. Thích nghe nhạc cũng rất nhiều điều thú vị. Bạn có thích

nghe nhạc không, nếu vậy, hãy kết bạn với tôi!

ko chép mạng 100%

nhưng bài có vr hơi ngắn

I'm a person who loves to listen to music. Listening to

music will help me feel refreshed, pleasant during times

of fatigue, overwork, while listening to music also helps

us learn a lot of things. Interest in listening to music is

also a lot of interesting. Do you listening to music,

if so, please make friends with me!

Theo bài ra ta cs 

\(2x=3y\Rightarrow\frac{x}{3}=\frac{y}{2}\)

\(4y=5z\Rightarrow\frac{y}{5}=\frac{z}{4}\)

T lại cs 

\(\frac{x}{3}=\frac{y}{2}\Rightarrow\frac{x}{15}=\frac{y}{10}\left(1\right)\)

\(\frac{y}{5}=\frac{z}{4}\Rightarrow\frac{x}{10}=\frac{z}{8}\left(2\right)\)

Từ (1);(2) \(\Rightarrow\frac{x}{15}=\frac{y}{10}=\frac{z}{8}\)

ADTC dãy tỉ số bằng nhau ta cs 

\(\frac{x}{15}=\frac{y}{10}=\frac{z}{8}=\frac{2x+3y-4z}{2.15+3.10-4.8}=\frac{56}{28}=2\)

\(\Rightarrow\hept{\begin{cases}\frac{x}{15}=2\\\frac{y}{10}=2\\\frac{z}{8}=2\end{cases}\Rightarrow\hept{\begin{cases}x=30\\y=20\\z=16\end{cases}}}\)

6 tháng 3 2020

\(2x=3y;4y=5z\) => \(8x=12y;12y=15z\)

=>  \(\frac{8x}{120}=\frac{12y}{120}=\frac{15z}{120}\)=> \(\frac{x}{15}=\frac{y}{10}=\frac{z}{8}\)

=>   \(\frac{2x}{30}=\frac{3y}{30}=\frac{4z}{32}\)

Áp dụng tính chất dãy tỉ số bằng nhau ta có:

\(\frac{2x}{30}=\frac{3y}{30}=\frac{4z}{32}=\frac{2x+3y-4z}{30+30-32}=\frac{56}{28}\)

=> \(\frac{2x}{30}=2=>2x=60=>x=30\)

\(\frac{3y}{30}=2=>3y=60=>y=20\)

\(\frac{4z}{32}=2=>4z=64=>z=16\)