用简便方法计算 49.5*13.5+50.5*13-0.5*49.5
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/08/15 05:17:20
用简便方法计算 49.5*13.5+50.5*13-0.5*49.5
![用简便方法计算 49.5*13.5+50.5*13-0.5*49.5](/uploads/image/z/16185673-1-3.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97+49.5%2A13.5%2B50.5%2A13-0.5%2A49.5)
解
49.5*13.5+50.5*13-0.5*49.5
=49.5×(13.5-0.5)+50.5×13
=49.5×13+50.5×13
=13×(49.5+50.5)
=13×100
=1300
49.5*13.5+50.5*13-0.5*49.5
=49.5×(13.5-0.5)+50.5×13
=49.5×13+50.5×13
=13×(49.5+50.5)
=13×100
=1300