搜搜考试网(1/4+1/5+1/6+...+1/671)(1/3+1/4+1/5+...+1/670)-(1/3+1/4+1/5+
来源：学生作业帮 编辑：搜搜考试网作业帮 分类：数学作业 时间：2024/07/11 02:47:05
(1/4+1/5+1/6+...+1/671)(1/3+1/4+1/5+...+1/670)-(1/3+1/4+1/5+...+1/671)(1/4+1/5+1/6+...+1/670)=
=(1/4+...+1/670 + 1/671) (1/3+...+1/670) - (1/3+ ...+ 1/670 + 1/671) (1/4+ ...+1/670)
=(1/4+...+1/670) * (1/3+...+1/670) + 1/671* (1/3+...+1/670) - (1/3+ ...+1/670) * (1/4+ ...+1/670) - 1/671*(1/4+ ...+1/670)
=1/671* (1/3+...+1/670) - 1/671*(1/4+ ...+1/670)
=1/671 * (1/3 + ...1/670 - (1/4+ ...+1/670))
=1/671 * (1/3-1/4)
=1/(671*12)
=1/8052
=(1/4+...+1/670) * (1/3+...+1/670) + 1/671* (1/3+...+1/670) - (1/3+ ...+1/670) * (1/4+ ...+1/670) - 1/671*(1/4+ ...+1/670)
=1/671* (1/3+...+1/670) - 1/671*(1/4+ ...+1/670)
=1/671 * (1/3 + ...1/670 - (1/4+ ...+1/670))
=1/671 * (1/3-1/4)
=1/(671*12)
=1/8052
(1/4+1/5+1/6+...+1/671)(1/3+1/4+1/5+...+1/670)-(1/3+1/4+1/5+
数学题(1/4+1/5+1/6+...+1/671)(1/3+1/4+1/5+..+1/670)-(1/3+1/4+1/
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1+1+1+1+11+-1-1-1-1-2-3-4-5-6等于
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1/2+1/2*1/3+1/3*1/4+1/4*1/5+1/5*1/6+1/6*1/7+.1/1999*1/2000得多
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1+1+1+1+1+1+1+1+1+2+5+4+8+3+6+2+1+4等于多少?
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