问题
解答题
(1)计算:(-2)3+
(2)化简:
|
答案
(1)原式=-8+
-1 2
(3分)=-8(4分)1 2
(2)原式=
-(m+1)2 (m+1)(m-1)
=2 m-1
-m+1 m-1
(2分)2 m-1
=
=m+1-2 m-1
=1(4分)m-1 m-1
(1)计算:(-2)3+
(2)化简:
|
(1)原式=-8+
-1 2
(3分)=-8(4分)1 2
(2)原式=
-(m+1)2 (m+1)(m-1)
=2 m-1
-m+1 m-1
(2分)2 m-1
=
=m+1-2 m-1
=1(4分)m-1 m-1