(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:大师作文网作业帮 分类:数学作业 时间:2024/09/20 22:43:02
(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/
-1/2,+1/3,-1/4,+1/5,-1/6,.
(1+1/2+1/3+1/4+1/5)*(1/3+1/4+1)-(1+1/3+1/4)*(1/2+1/3+1/4+1/5
1+1+1+1+11+-1-1-1-1-2-3-4-5-6等于
1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 1 6 15 20 15 6 1
线性代数解行列式1/2 1/3 1/4 1/51/3 1/4 1/5 1/61/4 1/5 1/6 1/7 1/5 1/
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
1、求|1-1/2|+|1/2-1/3|+|1/3-1/4|+|1/4-1/5|+|1/5-1/6|+|1/6-1/7|
1+1+1+1+1+1+1+1+1+2+5+4+8+3+6+2+1+4等于多少?
(1+1/2)*(1+1/4)*(1+1/6)*(1+1/8)*(1+1/3)*(1+1/5)*(1+1/7)*(1+1
/1/3-1/2/+/1/4-1/3/+/1/5-1/4/+.+/1/10-1/9/