问题
解答题
已知:
|
答案
∵
=x
+a
,1 a
∴x=a+
+2,1 a
x-2=a+
,(x-2)2=(a+1 a
)21 a
即:x2-4x=a2+
-2=(a-1 a2
)21 a
∴原式=
•(x+3)(x-2) x
•x(x-2) x+3
=(x-2)2-x-2+ x2-4x x-2- x2-4x
=(a+a+
+1 a (a-
)21 a a+
-1 a (a-
)21 a
)2-1 a
,a+
+1 a (a-
)21 a a+
-1 a (a-
)21 a
∵0<a<1,∴a-
<0,1 a
∴原式=a2+
+2-1 a2 a+
-a+1 a 1 a a+
+a-1 a 1 a
=a2+
+2-1 a2 1 a2
=a2+2.