0.2=(2.8x)/(0.4x^2+1.3)

解

0.2 = \frac{2.8 x}{0.4 x ^{2} + 1.3}

x = \frac{2.8 + 7.7568}{0.16}, x = \frac{2.8 - 7.7568}{0.16}

十進法表記

x = 34.90689 \dots, x = 0.09310 \dots

解答ステップ

0.2 = \frac{2.8 x}{0.4 x ^{2} + 1.3}

以下で両辺を乗じる:

0.4 x^{2} + 1.3

0.2 (0.4 x^{2} + 1.3) = 2.8 x

解く

0.2 (0.4 x^{2} + 1.3) = 2.8 x : x = \frac{2.8 + 7.7568}{0.16}, x = \frac{2.8 - 7.7568}{0.16}

x = \frac{2.8 + 7.7568}{0.16}, x = \frac{2.8 - 7.7568}{0.16}