2015-100-90-80-70一直减减减减到十怎么计算?

2025-06-22 05:01:17
推荐回答(2个)
回答1:

2015-100-90-80-70一直减减减减到十怎么计算?
解:2015-100-90-80-……-10
=2015-(100+90+80+……+10)
=2015-(100+10)×10÷2
=2015-550
=1465

回答2:

2015-100-90-80-……-10
=2015-(100+90+80+……+10)
=2015-(100+10)×10÷2
=2015-550
=1465