（1+1/2)×(1+1/4)×(1+1/6)×...×(1+1/10)×(1-1/3)×(1-1/5)×...×(1-

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 2/1 3/1 4/1 5/1 6/1 8/1 10/1 12/1 15/1 20/1 (1+1/2)x(1+1/4)x(1+1/6)x...x(1+1/10)x(1-1/3)x(1-1/5)x..x(1-1 (1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10+1/11+1/12+1/13+1/14+1/ -1/2,+1/3,-1/4,+1/5,-1/6,. /1/3-1/2/+/1/4-1/3/+/1/5-1/4/+.+/1/10-1/9/ 1 1 -1 1 -2 1 1 -3 3 -1 1 -4 6 -4 1 1 -5 10 x 5 -1 1 -6 15 - (1+1/2)*(1+1/4)*(1+1/6)*(1+1/8)*(1+1/3)*(1+1/5)*(1+1/7)*(1+1 1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10等于多少? （1+2/1）（1+4/1）（1+6/1）.（1+10/）（1-3/1）（1—5/1）.（1-9/1） 1+1+1+1+11+-1-1-1-1-2-3-4-5-6等于 (1/2+1/4+1/6+1/10+1/12+1/60)/(1+1/3+1/5+1/10+1/15+1/30)