Vì y nguyên \(\Rightarrow\hept{\begin{cases}\left(y-2018\right)^{2018}\in Z\\\left|y-2019\right|\in Z\end{cases}}\Rightarrow\hept{\begin{cases}y-2018=0\\\left|y-2019\right|=1\end{cases}ho\text{ặ}c}\hept{\begin{cases}\left(x-2018\right)^{2018}=1\\x-2019=0\end{cases}}\Rightarrow\hept{\begin{cases}x=2018\\x=2019\\x=2020\left(lo\text{ại}\right)\end{cases}}\)

Vậy......

:(( x=2018 và x=2019 thì x= mấy >: 

Hình như là

a/b=2018a/2018b

Vì a/b<c/d

=>2018a/2018b<c/d

=>2018a+c/2018b+d<c+d

ko đăng linh tinh

I found a love for me
Darling just dive right in
And follow my lead
Well I found a girl beautiful and sweet 
I never knew you were the someone waiting for me
'Cause we were just kids when we fell in love

Not knowing what it was
I will not give you up this time
But darling, just kiss me slow, your heart is all I own
And in your eyes you're holding mine

Baby, I'm dancing in the dark with you between my arms
Barefoot on the grass, listening to our favorite song
When you said you looked a mess, I whispered underneath my breath
But you heard it, darling, you look perfect tonight

Well I found a woman, stronger than anyone I know
She shares my dreams, I hope that someday I'll share her home
I found a love, to carry more than just my secrets
To carry love, to carry children of our own
We are still kids, but we're so in love
Fighting against all odds
I know we'll be alright this time
Darling, just hold my hand
Be my girl, I'll be your man
I see my future in your eyes

Baby, I'm dancing in the dark, with you between my arms
Barefoot on the grass, listening to our favorite song
When I saw you in that dress, looking so beautiful
I don't deserve this, darling, you look perfect tonight

Baby, I'm dancing in the dark, with you between my arms
Barefoot on the grass, listening to our favorite song
I have faith in what I see
Now I know I have met an angel in person
And she looks perfect
I don't deserve this
You look perfect tonight

Nhạc sĩ: Edward Christopher Sheeran

đặt x-2016=a

y-2017=b

z-2018=c

ta có\(\frac{1}{\sqrt{a}}-\frac{1}{a}+\frac{1}{\sqrt{b}}-\frac{1}{b}+\frac{1}{\sqrt{c}}-\frac{1}{c}=\frac{3}{4}\)

=>\(\left(\frac{1}{\sqrt{a}}-\frac{1}{2}\right)^2+\left(\frac{1}{\sqrt{b}}-\frac{1}{2}\right)^2+\left(\frac{1}{\sqrt{c}}-\frac{1}{2}\right)^2=0\)

=>\(a=b=c=4\)

còn lại tự lm nốt

oke cao van duc

thank nhiều nha

hok tốt

giúp mình nha!!!

rộng là 100 % nên

\(\frac{150}{100}=\frac{3}{2}\)

nửa chu vi là

52,5:2=26,25 m

chiều dài là

26,25 : (3+2) x 3=15,75m

chiều rộng là

26,25-15,75 = 10,5m

diện tích là

15,75 x 10,5 = 165,375m2

đáp số 165,375m2

\(A=\frac{1}{1\cdot2\cdot3}+\frac{1}{2\cdot3\cdot4}+\frac{1}{3\cdot4\cdot5}+...+\frac{1}{20\cdot21\cdot22}\)

\(A=\frac{1}{2}\left[\frac{2}{1\cdot2\cdot3}+\frac{2}{2\cdot3\cdot4}+\frac{2}{3\cdot4\cdot5}+...+\frac{2}{20\cdot21\cdot22}\right]\)

\(A=\frac{1}{2}\left[\frac{1}{1\cdot2}-\frac{1}{2\cdot3}+\frac{1}{2\cdot3}-\frac{1}{3\cdot4}+...+\frac{1}{20\cdot21}-\frac{1}{21\cdot22}\right]\)

\(A=\frac{1}{2}\left[\frac{1}{2}-\frac{1}{21\cdot22}\right]=\frac{1}{2}\cdot\frac{115}{231}=\frac{230}{231}>\frac{57}{231}(đpcm)\)

Sửa dùm chút :v

Chỗ \(\frac{1}{2}\cdot\frac{115}{231}=\frac{115}{462}>\frac{57}{231}(đpcm)\)

có phải là

\(\frac{1}{2007}\)

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