làm bài nào v

V, 1. stomachache

2. toothache

3. headache

4. backache

5. cough

6. sore throat

7. flu

8. earache

Là a.c, a.h nguyên tố vật liệu là 2 x4.0. ac ad ag

Ta có: \(\overline{X}=\dfrac{7.5+8.3+9.n+10.1}{5+3+n+1}\)

\(\Rightarrow8=\dfrac{69+9n}{9+n}\)

\(\Leftrightarrow69+9n=72+8n\)

\(\Leftrightarrow n=3\)

Vậy: \(n=3\)

\(Ta \) \(có \) \(đẳng \) \(thức : \)

\(X= \dfrac{7. 5 + 8 . 3 + 9 . n + 10 . 1}{5 + 3 + n + 1 } \) 

\(\rightarrow\) \(X = \dfrac{ 35 + 24 + 9n + 10}{ 9 + n }\)

\(\rightarrow 8 = \dfrac{69 + 9n}{ 9 + n }\) 

\(\rightarrow 72 + 8n = 69 + 9n \)

\(\rightarrow 9n - 8n = 72 - 69 \)

\(\rightarrow n = 3 \)

\(Vậy \) \(n = 3 \) 

He works so hard in the gym because he's like to be pilot

A nhé bạn 

21/25;60/81;19/29  

21/25;60/81;19/29

\(2^n:8=512\)

=> \(2^n=512\cdot8\)

=> \(2^n=4096\)

=> \(2^n=2^{12}\)

=> n = 12

\(2^n\div8=512\)

\(\Rightarrow\)\(2^n=512\times8\)

\(\Rightarrow\)\(2^n=4096\)

\(\Rightarrow\)\(2^n=2^{12}\)

\(\Rightarrow\)\(n=12\)