Question

Решите уравнение
$0,3 x^{2} -9 x=0$

Answer 1

$0,3x^2 -9x=0; \ \ x \cdot (0,3 x-9)=0; \\ \\ \boxed{x=0}; \ \ \ \ 0,3x=9, \ \ x=\frac{9}{0,3}=\frac{9}{\frac{3}{10}}=\frac{90}{3}=30; \ \ \boxed{x=30}$

Answer 2

$0.3 x^{2} -9x=0\\x(0.3x-9)=0\\x=0\\0.3x-9=0\\0.3x=9\\x=30$