Đề bài ? Tìm x,y à

Ta có : \(\left(2x-1\right)^{2014}\) \( \geq\) \(0\) với mọi x

           \(\left(x-y-\frac{1}{2}\right)^{2016}\) \( \geq\) \(0\) với mọi x ; y

\(\implies\)\(\left(2x-1\right)^{2014}+\left(x-y-\frac{1}{2}\right)^{2016}\) \( \geq\) \(0\) với mọi x ; y

Mà \(\left(2x-1\right)^{2014}+\left(x-y-\frac{1}{2}\right)^{2016}=0\) 

\(\implies\) Dấu bằng xảy ra \(\iff\) \(\hept{\begin{cases}\left(2x-1\right)^{2014}=0\\\left(x-y-\frac{1}{2}\right)^{2016}=0\end{cases}}\) \(\iff\) \(\hept{\begin{cases}2x-1=0\\x-y-\frac{1}{2}=0\end{cases}}\) \(\iff\) \(\hept{\begin{cases}x=\frac{1}{2}\\y=0\end{cases}}\)  

Ann lives in London. She is twenty nine and works (1) _works_____ the BBC. She interviews people on an early morning news program called The World Today. Every weekday she (2) ___gets____ up at 3 in the morning because the program starts at 6.30. She loves (3) __her______ work because it is exciting and she meets a lot of interesting people, and she loves her weekends, (4) ___too_______

            On Fridays, she comes (5) __home______from the BBC at about 2 in the afternoon and she just relax. On Friday evenings she doesn’t go out, but sometimes a friends comes for (6) _dinner_____ He or she brings wine and they cook. Ann (7) ___loves___ cooking. They listen to music or just chat.

            On Saturday mornings she gets up at 9 and she goes shopping. Then in the evening she sometimes goes to the theater or the opera (8) __with_______a friend – she loves opera. Then they eat in her favorite Chinese restaurant. On Sunday morning she stays in bed late. She doesn’t get up (9) __until______ 11 o’clock. Sometimes in the afternoon, she visits her sister. She lives in the country and has two (10) __children_______.  She s playing with her niece and nephew, but she leaves early because she goes to bed at 8 on Sunday evenings..

# HOK TỐT #

1my;2to;3have;4me;5zebra;6cream;7season;8good;9fish

https://olm.vn/hoi-dap/detail/78501273833.html

tham khaor

Tham khaorlink này nek:

https://olm.vn/hoi-dap/detail/3644490629.html

# mui #

Xet \(M-1=a+\frac{2a+2}{2-b}-\left(\frac{2a-b}{2+b}+1\right)+\frac{4a}{b^2-4}\)

=\(a+\left(2a+2\right)\left(\frac{1}{2-b}-\frac{1}{2+b}\right)+\frac{4a}{b^2-4}\)

=\(\frac{ab^2-4a-4ab-4b+4a}{b^2-4}\)

=\(\frac{ab^2-4ab-4b}{b^2-4}\)

den doan nay em xet rieng tu so \(ab^2-4ab-4b\)

thay b=a/a+1 vao \(\frac{a^3}{\left(a+1\right)^2}-\frac{4a^2}{a+1}-\frac{4}{a+1}\)

=\(\frac{a\left(a+2\right)\left(-3a-2\right)}{\left(a+1\right)^2}\)

xet mau so b^2-4=(a/a+1)^-4

=\(\frac{\left(a+2\right)\left(-3a-2\right)}{\left(a+1\right)^2}\)

den day thay vao la xong nha

i don't know ok

Trả lời 

chữ số thứ 10 trong số 23453,213 là số :0 

chúc bạn học tôt!

Dù gì cũng là:0 thôi

bên trên phần b là n chia hết cho 40 nha

2. Câu hỏi của Đình Hiếu - Toán lớp 7 - Học toán với OnlineMath

link hơi dài nhưng bn tham khảo nha:

https://lazi.vn/edu/exercise/cho-oz-la-tia-phan-giac-cua-goc-xoy-co-so-do-la-60-do-tu-b-thuoc-ox-ve-duong-thang-song-song-voi-oy