1/24+1/120+1/360+1/840的解法,请哪位哥哥,

问题描述:

1/24+1/120+1/360+1/840的解法,
请哪位哥哥,

这哪用什么解法呀!通分不就得了

没有别的好方法,只有通分!
1/24+1/120+1/360+1/840
=15/360+3/360+1/360+1/840
=19/360+1/840
=133/2520+3/2520
=17/315

1/24+1/120+1/360+1/840=(1/24)(1+1/5+1/15+1/35)=(1/24)*(105+21+7+3)/105=(1/24)*(136/105)=17/315