3/4+3/28+3/70+3/130=

来源：学生作业帮助网编辑：六六作业网时间：2024/12/20 22:40:41

3/4+3/28+3/70+3/130=3/4+3/28+3/70+3/130=3/4+3/28+3/70+3/130=3/4+3/28+3/70+3/130=1-1/4+3/28+3/70+3/13

3/4+3/28+3/70+3/130=
3/4+3/28+3/70+3/130=

3/4+3/28+3/70+3/130=
3/4+3/28+3/70+3/130
=1-1/4+3/28+3/70+3/130
=1-1/7+3/70+3/130
=1-1/10+3/130
=1-1/13
=12/13

84/91

3/4+3/28+3/70+3/130=1-1/4+1/4-1/7+1/7-1/10+1/10-1/13=12/13

3/4+3/28+3/70+3/130=21/28+3/28+3/70+3/130=
6/7+3/70+3/130=60/70+3/70+3/130=9/10+3/130=117/130+3/130=12/13