1/4+1/28+1/70+1/130
来源：学生作业帮助网 编辑：六六作业网 时间：2025/01/30 14:39:28
1/4+1/28+1/70+1/1301/4+1/28+1/70+1/1301/4+1/28+1/70+1/1301/4+1/28+1/70+1/130=2/7+1/70+1/130=3/10+1/1
1/4+1/28+1/70+1/130
1/4+1/28+1/70+1/130
1/4+1/28+1/70+1/130
1/4+1/28+1/70+1/130=2/7+1/70+1/130=3/10+1/130=4/13