练习册80) 用简便方法计算 (o.75x42.6—o.574x25+57.4)÷3

问题描述:

练习册80) 用简便方法计算 (o.75x42.6—o.574x25+57.4)÷3

(o.75x42.6—o.574x25+57.4)÷3
=(o.75x42.6+(—57.4x0.25+57.4))÷3
=0.75x(42.6+57.4)÷3
=0.25x100
=25