问题
解答题
9.75+99.75+999.75+9999.75.
答案
9.75+99.75+999.75+9999.75,
=(9+0.75)+(99+0.75)+(999+0.75)+(9999+0.75),
=(10-1)+(100-1)+(1000-1)+(10000-1)+0.75×4,
=11110-4+3,
=11109.
9.75+99.75+999.75+9999.75.
9.75+99.75+999.75+9999.75,
=(9+0.75)+(99+0.75)+(999+0.75)+(9999+0.75),
=(10-1)+(100-1)+(1000-1)+(10000-1)+0.75×4,
=11110-4+3,
=11109.