四十九乘二分之二十一等于多少?
3个回答
展开全部
49×2分之21
=(50-1)×21/2
=50×21/2-21/2
=25×(20+1)-20/2-1/2
=25×20+25×1-10-1/2
=500+25-10-1/2
=515-1/2
=514又2分之1
=(50-1)×21/2
=50×21/2-21/2
=25×(20+1)-20/2-1/2
=25×20+25×1-10-1/2
=500+25-10-1/2
=515-1/2
=514又2分之1
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
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