9+99+999+9999+99999+999999+9999999+99999999=?
问题描述:
9+99+999+9999+99999+999999+9999999+99999999=?
答
=99999999 +9 100000008*8=800000016
9+99+999+9999+99999+999999+9999999+99999999=?
=99999999 +9 100000008*8=800000016