问题
解答题
已知x=a是方程x2-x=6的解,求
|
答案
原式=
÷a-2 (a+1)(a-1) a2-1-2a+1 a+1
=
÷a-2 (a+1)(a-1) a(a-2) a+1
=
•a-2 (a+1)(a-1) a+1 a(a-2)
=1 a(a-1)
=
,1 a2-a
∵x=a是方程x2-x=6的解,
∴a2-a=6,
∴原式=
.1 6
已知x=a是方程x2-x=6的解,求
|
原式=
÷a-2 (a+1)(a-1) a2-1-2a+1 a+1
=
÷a-2 (a+1)(a-1) a(a-2) a+1
=
•a-2 (a+1)(a-1) a+1 a(a-2)
=1 a(a-1)
=
,1 a2-a
∵x=a是方程x2-x=6的解,
∴a2-a=6,
∴原式=
.1 6