a^-1=10001*9999,则a=
问题描述:
a^-1=10001*9999,则a=
答
a^2-1=10001*9999
=10000^2-1
a=10000
a^-1=10001*9999,则a=
a^2-1=10001*9999
=10000^2-1
a=10000