69.71-18.63+21.27用简便计算怎么算？
展开全部
69.71-18.63+21.27
=69+0.71-（18+0.63）+21+0.27
=69+21-18+0.71-0.63+0.27
=90-18+0.71-0.63+0.27+0.27-0.27
=72+0.71+0.27+0.27-0.63-0.27
=72+0.71+0.54-0.9
=72+0.71+0.29+0.25-1+0.1
=72+1+0.25-1+0.1
=72+0.25+0.1+1-1
=72+0.35
=72.35
=69+0.71-（18+0.63）+21+0.27
=69+21-18+0.71-0.63+0.27
=90-18+0.71-0.63+0.27+0.27-0.27
=72+0.71+0.27+0.27-0.63-0.27
=72+0.71+0.54-0.9
=72+0.71+0.29+0.25-1+0.1
=72+1+0.25-1+0.1
=72+0.25+0.1+1-1
=72+0.35
=72.35
本回答由网友推荐
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
