问题
解答题
化简求值:
|
答案
÷(a-a-b a
)2ab-b2 a
=
÷a-b a a2-2ab+b2 a
=
×a-b a a (a-b)2
=
.1 a-b
当a=
,b=-1时,原式=1 2
=1
-(-1)1 2
.2 3
化简求值:
|
÷(a-a-b a
)2ab-b2 a
=
÷a-b a a2-2ab+b2 a
=
×a-b a a (a-b)2
=
.1 a-b
当a=
,b=-1时,原式=1 2
=1
-(-1)1 2
.2 3