神马品牌网文明5秦mod:小学数学简便运算题
来源：百度文库 编辑：神马品牌网 时间：2024/05/08 00:55:47
0.225×0.335+0.335×0.775+0.775×0.225
要简便,我只想到把前面两个式子用乘法分配律,后面只能死算,
不知有没有整个算式的都能简便的算法.
要简便,我只想到把前面两个式子用乘法分配律,后面只能死算,
不知有没有整个算式的都能简便的算法.
解：0.225×0.335+0.335×0.775+0.775×0.225
=(0.225+0.775)×0.335+0.775×0.225
=1×0.335+0.775×0.225
=0.335+0.174375
=0.509375
=0.225×0.335+0.335×0.775+0.775×0.225
=(0.225+0.775)×0.335+0.775×0.225
=1×0.335+0.775×0.225
=0.335+0.174375
=0.509375
0.225×0.335+0.335×0.775+0.775×0.225
=(0.225+0.775)×0.335+0.775×0.225
=1×0.335+0.775×0.225
=0.509375
(0.225+0.775)×0.335+0.775×0.225