作业帮3/4+3/28+3/70+3/130=
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/15 09:25:31
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