Question

[Nguyễn Thị Chi]

Tìm x, y, z

a) \(\sqrt{16}x+\frac{3}{4}=2\sqrt{\frac{4}{25}}+0,01.\sqrt{100}\)

b) \(\left|x\right|+3^2=2^2+\left(\frac{1}{2}\right)^3\)

c) \(2x\left(x-\frac{2}{3}\right)=0\)

d) \(\frac{37-x}{x+13}=\frac{3}{7}\)

Answer 1

[Nguyễn Lê Phước Thịnh]

a: \(\Leftrightarrow4x+\dfrac{3}{4}=2\cdot\dfrac{2}{5}+0.01\cdot10=\dfrac{9}{10}\)

=>4x=3/20

hay x=3/80

b: \(\Leftrightarrow\left|x\right|=4+\dfrac{1}{8}-9=-\dfrac{39}{8}\)(vô lý)

c: 2x(x-2/3)=0

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x-\dfrac{2}{3}=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=\dfrac{2}{3}\end{matrix}\right.\)

d: \(\dfrac{37-x}{x+13}=\dfrac{3}{7}\)

=>259-7x=3x+39

=>-10x=-220

hay x=22