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解分式方程1\x-1-2x\x^2-1=1

题目详情
▼优质解答
答案和解析
1 / (x - 1)- 2 x / (x ² - 1)= 1
(x + 1)/ (x + 1)(x - 1)- 2 x /(x + 1)(x - 1)= 1
两边乘以 (x + 1)(x - 1)得:
x + 1 - 2 x = (x + 1)(x - 1)
1 - x = x ² - 1
x ² - x - 2 = 0
(x - 2)(x + 1)= 0
x - 2 = 0 或 x + 1 = 0
∵ (x + 1)(x - 1)≠ 0
∴ x + 1 ≠ 0 ,x - 1 ≠ 0
∴ x - 2 = 0
x = 2