问题
填空题
99+9+9999+999+99999=______.
答案
99+9+9999+999+99999,
=9+99+999+9999+99999,
=(10-1)+(100-1)+(1000-1)+(10000-1)+(100000-1),
=(100000+10000+1000+100+10)-(1+1+1+1+1),
=111110-5,
=111105;
故答案为:111105.
99+9+9999+999+99999=______.
99+9+9999+999+99999,
=9+99+999+9999+99999,
=(10-1)+(100-1)+(1000-1)+(10000-1)+(100000-1),
=(100000+10000+1000+100+10)-(1+1+1+1+1),
=111110-5,
=111105;
故答案为:111105.