(19x)/(20)-(x-1)/(10)=x

解答

\frac{19 x}{20} - \frac{x - 1}{10} = x

x = \frac{2}{3}

十进制

x = 0.66666 \dots

求解步骤

\frac{19 x}{20} - \frac{x - 1}{10} = x

乘以最小公倍数

19 x - 2 (x - 1) = 20 x

乘开

- 2 (x - 1) : - 2 x + 2

19 x - 2 x + 2 = 20 x

\frac{4}{5} x - \frac{1}{8} \leq \frac{7}{10} x - \frac{8}{5}

s im pl i f y \frac{\frac{12}{13}}{\frac{- 5}{13}}

lo g_{\frac{3}{5}} (30) = 40

f a c t or 10 d^{2} + 17 d - 20

(x - 2)^{2} + 5 \geq 0