2/56+2/72+2/90+2/110+2/132

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/15 11:06:45

2/56+2/72+2/90+2/110+2/132
2/56+2/72+2/90+2/110+2/132

2/56+2/72+2/90+2/110+2/132
等于2*(1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11+1/11-1/12)
=2*(1/7-1/12)
=2*(5/84)
=5/42

通分一下 5/42