25 Oct 2014, 19:28
\(0,01\left [ \left ( 0,04-0,1x \right ) /0,020\right ]^{2}+0,05x^{^{2}}=0,04\)
26 Oct 2014, 20:20
Veja
este tópico antes.
\(0.01(25x^2-20x+4)+0.05x^2=0.04\Leftrightarrow 0.25x^2-0.2x+0.04+0.05x^2=0.04\Leftrightarrow 0.3x^2-0.2x=0\Leftrightarrow x(0.3x-0.2)=0\Leftrightarrow x=0 \vee 0.3x-0.2=0\Leftrightarrow x=0 \vee x=\frac{2}{3}\)