10.4ⅹ0.25=(10+0.4)ⅹ0.25=10ⅹ0.25+0.4ⅹ0.25=2.5+0.1=2.6
10.4*0.25=(10+0.4)*0.25=10*0.25+0.4*0.25=2.5+0.1=2.6
10×0.25+0.1×4×0.25
拆开算
(10+0.4)x2.5解：=10x2.5+0.4x2.5=25+1=26祝学习进步。
