2/7+0.25+5/7-3/4 简便计算怎么算啊
问题描述:
2/7+0.25+5/7-3/4 简便计算怎么算啊
答
2/7+0.25+5/7-3/4
=(2/7+5/7)+(1/4-3/4)
=1-1/2
=1/2