\(x^{2} / 0.8 - 0.4 * x^{2 }/ 0.64 = 1000 \)
\((1/0.8)*x^{2}-(0.4/0.64)*x^{2}=1000 \)
\(((1/0.8)-(0.4/0.64))*x^{2}=1000 \)
\(0.625 * x^{2} = 1000\)
Student, Punkte: 10
\(x^{2} / 0.8 - 0.4 * x^{2 }/ 0.64 = 1000 \)
\((1/0.8)*x^{2}-(0.4/0.64)*x^{2}=1000 \)
\(((1/0.8)-(0.4/0.64))*x^{2}=1000 \)
\(0.625 * x^{2} = 1000\)