Window, iOS, Android,...

B1b)

Áp dụng BĐT \(\left|a\right|+\left|b\right|\ge\left|a+b\right|\) ta có:

\(B=\left|x-2\right|+\left|x-8\right|\)

\(B\ge\left|x-2\right|+\left|8-x\right|=6\)

Dấu "=" xảy ra khi \(\left(x-2\right)\left(8-x\right)\ge0\)

\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x-2\le0\\8-x\le0\end{matrix}\right.\\\left\{{}\begin{matrix}x-2\ge0\\8-x\ge0\end{matrix}\right.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x\le2\\x\ge8\end{matrix}\right.\left(C\right)}\\\left\{{}\begin{matrix}x\ge2\\x\le8\end{matrix}\right.\left(L\right)}\end{matrix}\right.\)

TH1: chọn, TH2: loại.

Vậy \(MIN_B=6\Leftrightarrow2\le x\le8\)

trường mình k học tin 8 đâu chỉ học tin 6, 7 thôi

Rearrange the sentences to make meaningful sentences

If/ I/ someone/ send/ will/ her/ I/ a/ love/ send/ snail mail.

A. If I send someone, I will love her a snail mail.

B. If I send her, I will love someone a snail mail.

C. If I love her, I will send someone a snail mail.

D. If I love someone, I will send her a snail mail.

(120-2):2+1=60

60.122:2=3660

tick nha mk tick lại cho

:D