问题
解答题
计算:1+
|
答案
原式=1-
•m-n m-2n
(3分)(m-2n)2 (m+n)(m-n)
=1-
=m-2n m+n
(4分)m+n-(m-2n) m+n
=
(5分)m+n-m+2n m+n
=
.(6分)3n m+n
计算:1+
|
原式=1-
•m-n m-2n
(3分)(m-2n)2 (m+n)(m-n)
=1-
=m-2n m+n
(4分)m+n-(m-2n) m+n
=
(5分)m+n-m+2n m+n
=
.(6分)3n m+n