问题
解答题
先化简,再求值:
|
答案
原式=
•m+1 2m(m-1)
-4m2 (m+1)2 m+1-m+1 (m+1)(m-1)
=
-2m (m-1)(m+1) 2 (m+1)(m-1)
=2m-2 (m+1)(m-1)
=
,2 m+1
当m=2时,原式=
=2 2+1
.2 3
先化简,再求值:
|
原式=
•m+1 2m(m-1)
-4m2 (m+1)2 m+1-m+1 (m+1)(m-1)
=
-2m (m-1)(m+1) 2 (m+1)(m-1)
=2m-2 (m+1)(m-1)
=
,2 m+1
当m=2时,原式=
=2 2+1
.2 3