1.What's your address?
2.What's your village like?
3.What do you do in the morning/afternoon/evening?
4.How often do you come to the library?
5.Did you go to the party?
6.What did you at the party?
K
Khách
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TT
17 tháng 8 2020
Ta có : \(\left|x-\frac{1}{3}\right|=\frac{5}{6}\)
\(\Leftrightarrow\orbr{\begin{cases}x-\frac{1}{3}=\frac{5}{6}\\x-\frac{1}{3}=-\frac{5}{6}\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=\frac{7}{6}\\x=\frac{-1}{2}\end{cases}}\)
XO
17 tháng 8 2020
Ta có :\(\left|x-\frac{1}{3}\right|=\frac{5}{6}\)
=> \(\orbr{\begin{cases}x-\frac{1}{3}=\frac{5}{6}\\x-\frac{1}{3}=-\frac{5}{6}\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{5}{6}+\frac{1}{3}\\x=-\frac{5}{6}+\frac{1}{3}\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{7}{6}\\x=-\frac{1}{2}\end{cases}}\)
Vậy \(x\in\left\{\frac{7}{6};-\frac{1}{2}\right\}\)
NV
1
XO
17 tháng 8 2020
\(\frac{2004\times2004+3006}{2005\times2005-1003}=\frac{2004\times2004+3006}{\left(2004+1\right)\times\left(2004+1\right)-1003}\)
\(\frac{2004\times2004+3006}{2004\times\left(2004+1\right)+1\times\left(2004+1\right)-1003}=\frac{2004\times2004+3006}{2004\times2004+2\times2004+1-1003}\)
\(=\frac{2004\times2004+3006}{2004\times2004+3006}=1\)
NV
3
TT
17 tháng 8 2020
Ta đi chứng minh \(A⋮2,A⋮5\)
+) Ta có : \(A=99999^{1999}-555557^{1997}\equiv1-1\equiv0\left(mod2\right)\)
\(\Rightarrow A⋮2\)
Lại có : \(99999\equiv\left(-1\right)\left(mod5\right)\)
\(\Rightarrow99999^{1999}\equiv\left(-1\right)\left(mod5\right)\)
Vì \(555557\equiv2\left(mod5\right)\)
\(\Rightarrow555557^{1997}\equiv2^{1997}\left(mod5\right)\)
Ta thấy rằng : \(2^2=4\equiv\left(-1\right)\left(mod5\right)\)
\(\Rightarrow\left(2^2\right)^{998}\equiv1\left(mod5\right)\)
\(\Rightarrow2^{1996}\equiv1\left(mod5\right)\)
\(\Rightarrow2^{1997}\equiv2\left(mod5\right)\)
Do đó : \(555557^{1997}\equiv2\left(mod5\right)\)
Vậy \(A\equiv\left(-1\right)-2\equiv\left(-3\right)\left(mod5\right)\)
Hum.... đề sai.
PD
18 tháng 8 2020
Hình dễ vẽ , bạn tự vẽ nha.
a) \(\Delta AKH\)vuông tại A có \(AK^2=KE.KH\)hay \(6^2=KE.10\Rightarrow KE=3,6\)
Vậy KE=3,6
17 tháng 8 2020
a) Để A có nghĩa <=> \(\hept{\begin{cases}2x+10\ne0\\x\ne0\\2x\left(x+5\right)\ne0\end{cases}}\) <=> \(\hept{\begin{cases}x\ne-5\\x\ne0\\x\ne0;x\ne-5\end{cases}}\) <=> \(\hept{\begin{cases}x\ne-5\\x\ne0\end{cases}}\)
b) A = \(\frac{x^2+2x}{2x+10}+\frac{x-5}{x}+\frac{50-5x}{2x\left(x+5\right)}\)
A = \(\frac{x\left(x^2+2x\right)+2\left(x-5\right)\left(x+5\right)+50-5x}{2x\left(x+5\right)}\)
A = \(\frac{x^3+2x^2+2\left(x^2-25\right)+50-5x}{2x\left(x+5\right)}\)
A = \(\frac{x^3+2x^2+2x^2-50+50-5x}{2x\left(x+5\right)}\)
A = \(\frac{x^3+4x^2-5x}{2x\left(x+5\right)}\)
A = \(\frac{x\left(x^2+4x-5\right)}{2x\left(x+5\right)}\)
A = \(\frac{x^2+5x-x-5}{2\left(x+5\right)}\)
A = \(\frac{\left(x-1\right)\left(x+5\right)}{2\left(x+5\right)}=\frac{x-1}{2}\)
1.My address is ......
2. My village is very beautiful and peaceful
3. In the morning, I often water the flower
In the afternoon, I often clean the house
In the evening, I often watch TV
4.I often go to the library two times a week
5.Yes, I did
6.At the party, I sang a lot of songs, ate birthday cake and danced
CHÚC BẠN HỌC TỐT
1 . My is address .......
2. My village is very beautiful and peaceful
3. In the morning , I often water the flo