大师作文网计算：-1/2-1/6-1/12-1/20-1/30-1/42用裂项法解答.
来源：学生作业帮 编辑：大师作文网作业帮 分类：数学作业 时间：2024/11/07 09:34:31
计算：-1/2-1/6-1/12-1/20-1/30-1/42用裂项法解答.
计算：4/3-7/12+9/20-11/30+13/42-15/56用裂项法解答.
计算：4/3-7/12+9/20-11/30+13/42-15/56用裂项法解答.
-1/2-1/6-1/12-1/20-1/30-1/42
=-1/2-1/2+1/3-1/3+1/4-1/4+1/5-1/5+1/6-+1/6-1/7
=-1-1/7
=-8/7
4/3-7/12+9/20-11/30+13/42-15/56
=1+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8
=1-1/8
7/8
=-1/2-1/2+1/3-1/3+1/4-1/4+1/5-1/5+1/6-+1/6-1/7
=-1-1/7
=-8/7
4/3-7/12+9/20-11/30+13/42-15/56
=1+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8
=1-1/8
7/8