9+99+99+999+9999+99999+999999+999999+9999999+99999999+999999999=?
问题描述:
9+99+99+999+9999+99999+999999+999999+9999999+99999999+999999999=?
答
9+99+99+999+9999+99999+999999+999999+9999999+99999999+999999999=?