(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=R
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=R
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)(用简算)
简算:(1+1/3+1/5+1/10+1/15+1/30)÷(1/2+1/4+1/6+1/12+1/20+1/60)=?
(1+1/3+1/5+1/10+1/15+1/30)÷(1/2+1/4+1/6+1/12+1/20+1/60)
(1/2+1/4+1/6+1/10+1/12+1/60)/(1+1/3+1/5+1/10+1/15+1/30)
2/1 3/1 4/1 5/1 6/1 8/1 10/1 12/1 15/1 20/1
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
已知1-2/1=2/1,1/2-3/1=6/1,3/1-4/1=12/1,4/1-5/1=20/1,5/1-6/1=30
已知2分之1=1-2/1,6/1=2/1-3/1,12/1=3/1-4/1,20/1=4/1-5/1,30/1=5/1-
(1/2-1/3)+(1/4-1/5)+(1/7-1/10)+(1/14-1/15)+(1/28-1/30)
(1/2-1/3)+(1/4-1/5)+(1/7-1/10)+(1/14-1/15)+(1/28-1/30))
(1+3分之1+5分之1+10分之1+15分之1+30分之1)÷(2分之1+4分之1+6分之1+12分之1+60分之1)