Question

Mong các bạn giúp.

1) \(\frac{2^8.\:6^5}{4^6.3^4}\).

2) tìm x

|3,5 - x | + \(\frac{2}{7}=\frac{16}{7}\).

Thank.

Answer 1

Answer 2

2)

\(\left|3,5-x\right|+\frac{2}{7}=\frac{16}{7}\)

\(\Rightarrow\left|3,5-x\right|=\frac{16}{7}-\frac{2}{7}\)

\(\Rightarrow\left|3,5-x\right|=2\)

\(\Rightarrow\left[{}\begin{matrix}3,5-x=2\\3,5-x=-2\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=3,5-2\\x=3,5+2\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=1,5\\x=5,5\end{matrix}\right.\)

Vậy \(x\in\left\{1,5;5,5\right\}.\)

Chúc bạn học tốt!