问题 解答题
化简求值:
a
b
+b
a
a
+
b
b
ab
-b
-
1
a
+
b
)÷
b
a-b
,其中a=3-
5
,b=3+
5
答案

a
b
+b
a
a
+
b
•(
b
ab
-b
-
1
a
+
b
)÷
b
a-b

=

ab
(
a
+
b
)
a
+
b
•(
1
a
-
b
-
1
a
+
b
)×
a-b
b

=

ab
2
b
a-b
×
a-b
b

=2

ab

当a=3-

5
,b=3+
5
时,原式=2
ab
=2
(3-
5
)(3+
5
)
=2
4
=4.

判断题
填空题