问题
解答题
化简并求值:(1+
|
答案
(1+
)÷3 a-2 a2-1 (a-2)2
=(
+a-2 a-2
)÷3 a-2 (a+1)(a-1) (a-2)2
=
×a+1 a-2 (a-2)2 (a+1)(a-1)
=
,a-2 a-1
把a=
代入原式得:2
原式=
=a-2 a-1
=
-22
-12
=-(
-2)(2
+1)2 (
+1)(2
-1)2
.2
化简并求值:(1+
|
(1+
)÷3 a-2 a2-1 (a-2)2
=(
+a-2 a-2
)÷3 a-2 (a+1)(a-1) (a-2)2
=
×a+1 a-2 (a-2)2 (a+1)(a-1)
=
,a-2 a-1
把a=
代入原式得:2
原式=
=a-2 a-1
=
-22
-12
=-(
-2)(2
+1)2 (
+1)(2
-1)2
.2