作业帮5/6-7/12+9/20-11/30+13/42
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/19 23:21:33
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5/6-7/12+9/20-11/30+13/42
5/6-7/12+9/20-11/30+13/42
5/6-7/12+9/20-11/30+13/42
5/6-7/12+9/20-11/30+13/42
=(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)
=1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7
=1/2+1/7
=7/14+2/14
=9/14