Question

НОМЕР 5 И 6 ДАЮ 20БАЛЛОВ

Answer 1

$x^2-\frac{16}{25}=0\\ x^2=\frac{16}{25}\\x=+-\frac{4}{5}$

x=4\5, x=-4\5

$|x|=\frac{4}{|x|}\\|x|^2=4\\x=\sqrt{4}\\=+-2$

x=2, x=-2

|x|=x:

xє[0;+∞)