26.25+73.75*0.35+0.65*73.5用简便方法怎么算?明天就交了,
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/07/12 12:16:20
26.25+73.75*0.35+0.65*73.5用简便方法怎么算?明天就交了,
![26.25+73.75*0.35+0.65*73.5用简便方法怎么算?明天就交了,](/uploads/image/z/7392889-1-9.jpg?t=26.25%2B73.75%2A0.35%2B0.65%2A73.5%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E6%80%8E%E4%B9%88%E7%AE%97%3F%E6%98%8E%E5%A4%A9%E5%B0%B1%E4%BA%A4%E4%BA%86%2C)
如果最后一个是73.75:
26.25+73.75*0.35+0.65*73.75=26.25+73.75*(0.35+0.65)
=26.25+73.75*1
=100
如果最后一个是73.5:
26.25+73.75*0.35+0.65*73.5=26.25+73.75*0.35+0.65*(73.75-0.25)
=26.25+73.75*0.35+0.65*73.75-0.65*0.25
=26.25+73.75*(0.35+0.65)-0.1625
=100-0.1625
=99.8375
26.25+73.75*0.35+0.65*73.75=26.25+73.75*(0.35+0.65)
=26.25+73.75*1
=100
如果最后一个是73.5:
26.25+73.75*0.35+0.65*73.5=26.25+73.75*0.35+0.65*(73.75-0.25)
=26.25+73.75*0.35+0.65*73.75-0.65*0.25
=26.25+73.75*(0.35+0.65)-0.1625
=100-0.1625
=99.8375