-1/2,+1/3,-1/4,+1/5,-1/6,.
-1/2,+1/3,-1/4,+1/5,-1/6,.
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
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?
(1-1/2^2)(1-1/3^2)(1-1/4^2)(1-1/5^2)(1-1/6^2)(1\1/7^2)(1-1/8
(1+1/2)*(1+1/4)*(1+1/6)*(1+1/8)*(1+1/3)*(1+1/5)*(1+1/7)*(1+1
1/1*3+1/2*4+1/3*5+1/4*6+.+1/18*20
1+1+1+2+1+3+1+4+1+5+1+6
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/
1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7