11+192+1993+19994+……+19999999999所得的数的数字之和是多少?
3个回答
展开全部
11+192+1993+19994+……+1999999999
=19-8+199-7+1999-6+19999-5+199999-4+1999999-3+19999999-2+199999999-1+1999999999
=(19+199+1999+19999+199999+1999999+19999999+199999999+1999999999)-(8+7+6+5+4+3+2+1)
=2222222220-9-8-7-6-5-4-3-2-1
=2222222175
你最后一个数多打了一个9.
=19-8+199-7+1999-6+19999-5+199999-4+1999999-3+19999999-2+199999999-1+1999999999
=(19+199+1999+19999+199999+1999999+19999999+199999999+1999999999)-(8+7+6+5+4+3+2+1)
=2222222220-9-8-7-6-5-4-3-2-1
=2222222175
你最后一个数多打了一个9.
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询