2-5/(2b)=(2b)/(b+1)

解答

2 - \frac{5}{2 b} = \frac{2 b}{b + 1}

b = - 5

求解步骤

2 - \frac{5}{2 b} = \frac{2 b}{b + 1}

乘以最小公倍数

4 b (b + 1) - 5 (b + 1) = 4 b^{2}

乘开

4 b (b + 1) : 4 b^{2} + 4 b

4 b^{2} + 4 b - 5 (b + 1) = 4 b^{2}

乘开

- 5 (b + 1) : - 5 b - 5

4 b^{2} + 4 b - 5 b - 5 = 4 b^{2}

x = \frac{1}{x} + 4

1 + \frac{4}{y} = \frac{11}{12 y}

so l v e f or x, y = \frac{1}{x - 3}

\frac{5}{12} = \frac{5 x - 9}{x}

2.5 = \frac{x}{1 - x}