问题
解答题
计算:[
|
答案
原式=[
•a+2 (a-1)2
•(a-2)2 a+1
]•a2-1 a2-4
,a-1 a-2
=[
•a+2 (a-1)2
•(a-2)2 a+1
]•(a-1)(a+1) (a -2)(a+2)
,a-1 a-2
=
•a-2 a-1
,a-1 a-2
=1.
计算:[
|
原式=[
•a+2 (a-1)2
•(a-2)2 a+1
]•a2-1 a2-4
,a-1 a-2
=[
•a+2 (a-1)2
•(a-2)2 a+1
]•(a-1)(a+1) (a -2)(a+2)
,a-1 a-2
=
•a-2 a-1
,a-1 a-2
=1.