7/x2+x+1/x2-x=6/x2-1

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7/x2+x+1/x2-x=6/x2-1
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7/x2+x+1/x2-x=6/x2-1
7/x2+x+1/x2-x=6/x2-1

7/x2+x+1/x2-x=6/x2-1
7/x(x+1)+1/x(x-1)=6/(x+1)(x-1)
两边乘x(x+1)(x-1)
7x-7+x+1=6x
2x=6
x=3
经检验,x=3是方程的解

对分母因式分
7 / x(x+1) + 1 / x(x-1) = 6 / (x+1)(x-1)
确定最简公分母:x(x+1)(x-1)
去分母:(方程两边同乘以x(x+1)(x-1)
7(x-1) + (x+1) = 6x
解得 x = 3 .

当x不等于 0、 -1 、1时两边同乘以x(x+1)(x
-1)
得7x-7+1+x=6x
x=3

7 / (x ² + x) + 1 / (x ² - x)= 6 / (x ² - 1)
7 / x(x + 1)+ 1 / x(x - 1) = 6 /(x + 1)(x - 1)
两边乘以 x(x + 1)(x - 1)得:
7(x - 1)+ (x + 1)= 6 x
...

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7 / (x ² + x) + 1 / (x ² - x)= 6 / (x ² - 1)
7 / x(x + 1)+ 1 / x(x - 1) = 6 /(x + 1)(x - 1)
两边乘以 x(x + 1)(x - 1)得:
7(x - 1)+ (x + 1)= 6 x
7 x - 7 + x + 1 = 6 x
8 x - 6 x = 7 - 1
2 x = 6
x = 3
检验:当 x = 3 时,x(x + 1)(x - 1)≠ 0
∴ x = 3 是原方程的解

收起

7/x2+x+1/x2-x=6/x2-1
7/x2-6/x2+1/x2+x-x=-1
2/x2=-1
2=-x2
x2=-2
如果x2是x²的话,该题在实数范围内无解。虚数范围内有两
x=±√2i