问题
解答题
马小虎对题目“化简并求值:
|
答案
不正确,
+1 a
=
+a2-21 a2
+1 a (a-
)21 a
=
+|a-1 a
|1 a
∵a=
,1 5
∴原式=
-a+1 a 1 a
=
-a2 a
=10-1 5
=9
.4 5
马小虎对题目“化简并求值:
|
不正确,
+1 a
=
+a2-21 a2
+1 a (a-
)21 a
=
+|a-1 a
|1 a
∵a=
,1 5
∴原式=
-a+1 a 1 a
=
-a2 a
=10-1 5
=9
.4 5