Question

(9又2分支1+7又6分支1+5又12分支1+3又20分支1)乘以12=

Answer 1

(9又2分支1+7又6分支1+5又12分支1+3又20分支1)×12=(9+1/2+7+1/6+5+1/12+3+1/20)×12=[(9+7+5+3)+(1/2+1/6+1/12+1/20)]×12=[24+1/(1×2)+1/(2×3)+1/(3×4)+1/(4×5)]×12=(24+1-1/2+1/2-1/3+1/3-1/4+1/4-1/5)×12=...