用简便方法计算:11+12-13-14+15+16-17-18+.+99+100
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/01 14:15:23
![用简便方法计算:11+12-13-14+15+16-17-18+.+99+100](/uploads/image/z/27862-70-2.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%3A11%2B12-13-14%2B15%2B16-17-18%2B.%2B99%2B100)
用简便方法计算:11+12-13-14+15+16-17-18+.+99+100
用简便方法计算:11+12-13-14+15+16-17-18+.+99+100
用简便方法计算:11+12-13-14+15+16-17-18+.+99+100
11+12-13-14+15+16-17-18+.+99+100
=11+12+(-13-14+15+16)+(-17-18+19+20)+...+(-97-98+99+100)
=11+12+4*(100-12)/4
=11+12+88
=111