问题
解答题
化简并求值:
|
答案
a=
=2-1 2+ 3 3
∴a-1=2-
-1=1-3
<0,3
∴原式=
-(a-1)2 a-1
-(a-1)2 a(a-1) 1 a
=a-1+
-1 a
=a-1;1 a
∴原式=1-
.3
化简并求值:
|
a=
=2-1 2+ 3 3
∴a-1=2-
-1=1-3
<0,3
∴原式=
-(a-1)2 a-1
-(a-1)2 a(a-1) 1 a
=a-1+
-1 a
=a-1;1 a
∴原式=1-
.3