Question

ПОМОГИТЕ ПОЖАЛУЙСТА!!!
СРОЧНО!!!​

Answer 1

$\frac{4}{x-20} =\frac{20}{x-4}$
$4(x-4)=20(x-20)$
$4x-16=20x-400$
$4x-20x=-400+16$
$-16x=-400+16$
$-16x=-384$
$x=24$
Ответ: x = 24

Answer 2

$\displaystyle\bf\\\frac{4}{x-20} =\frac{20}{x-4} \\\\\\\frac{4}{x-20} -\frac{20}{x-4} =0\\\\\\\frac{4\cdot(x-4)-20\cdot(x-20)}{(x-20)(x-4)}=0\\\\\\\frac{4x-16-20x+400}{(x-20)(x-4)}=0\\\\\\\frac{-16x+384}{(x-20)(x-4)} =0\\\\\\-16x+384=0 \ \ \ ; \ x-20\neq 0 \ \ ; \ \ x-4\neq 0\\\\\\-16x=-384 \ \ \ ; \ \ \ x\neq 20 \ \ \ ; \ \ \ x\neq 4\\\\\\x=24\\\\\\Otvet: \ 24$