7.5×2.3-0.5×2.5 22.5×0.4简便计算?
展开全部
简便运算主要是通过交换律、结合律,将相关数字交换结合,凑成整数,达到速算目的。
7.5×2.3-0.5×2.5+22.5×0.4
=2.5×3×2.3-2.5×0.5+9×2.5×0.4
=2.5×6.9+2.5×3.6-2.5×0.5
=2.5×(6.9+3.6-0.5)
=2.5×10
=25
7.5×2.3-0.5×2.5+22.5×0.4
=2.5×3×2.3-2.5×0.5+9×2.5×0.4
=2.5×6.9+2.5×3.6-2.5×0.5
=2.5×(6.9+3.6-0.5)
=2.5×10
=25
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
7.5×2.3-0.5×2.5+ 22.5×0.4
=2.5×(3×2.3)-0.5×2.5+ 2.5×(9×0.4)
=2.5×(6.9-0.5+3.6)
=2.5×10
=25
=2.5×(3×2.3)-0.5×2.5+ 2.5×(9×0.4)
=2.5×(6.9-0.5+3.6)
=2.5×10
=25
本回答被网友采纳
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
7.5×2.3-0.5×2.5+22.5×0.4
=2.5×3×2.3-0.5×2.5+22.5×0.4
=2.5×(6.9-0.5)+22.5×0.4
=2.5×6.4+22.5×0.4
=16+9
=25
=2.5×3×2.3-0.5×2.5+22.5×0.4
=2.5×(6.9-0.5)+22.5×0.4
=2.5×6.4+22.5×0.4
=16+9
=25
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