计算1m+2+4m2−4的结果是( ) A.m+2 B.m-2 C.1m+2 D.1m−2
问题描述:
计算
+1 m+2
的结果是( )4
m2−4
A. m+2
B. m-2
C.
1 m+2
D.
1 m−2
答
+1 m+2
=4
m2−4
=m−2+4 (m+2)(m−2)
.1 m−2
故选D.