问题
解答题
先化简,再求值:
|
答案
a2-ab a2-b2
=a(a-b) (a+b)(a-b)
=
,a a+b
当a=
b时,2
原式=
=
b2
b+b2
b2 (
+1)b2
=2
+12
=
(2
-1)2 (
+1)(2
-1)2
=2-
.2
先化简,再求值:
|
a2-ab a2-b2
=a(a-b) (a+b)(a-b)
=
,a a+b
当a=
b时,2
原式=
=
b2
b+b2
b2 (
+1)b2
=2
+12
=
(2
-1)2 (
+1)(2
-1)2
=2-
.2