(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)
(1/2-1/3)+(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)怎么算
(1/2-1/3)+(1/4-1/5)+(1/7-1/10)+(1/14-1/15)+(1/28+1/30)怎么算
(1)1+1/2+1/3+1/4+1/5+1/6+1/7+1/14+1/28
2分之1-3分之1的差+4分之1-5分之1的差+7分之1-10分之1的差加14分之1-15分之1的差+28分之1-30分
(2分之1-3分之1)+(4分之1-5分之1)+(7分之1-10分之1)+(14分之1-15分之1)+(28分之1+30
(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+1/4+1/6+1/10+1/12+1/60)/(1+1/3+1/5+1/10+1/15+1/30)
(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)
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=R
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)=?