问题 选择题
当a>0,b>0时,n是正整数,计算
a2n+1b6
-
a2n+3b4
的值是(  )
A.(b-a)
a2n+1b4
B.(anb3-an+1b2
a
C.(b3-ab2
a2n+1
D.(anb3+an+1b2
a
答案

原式=

a2nb6a
-
a2n+2b4a

=anb3

a
-an+1b2
a

=(anb3-an+1b2

a

故选B.

选择题
名词解释