Question

二分之一加六分之一加十二分之一加二十分之一加三十分之一=

你们三个各三个不同答案··

Answer 1

二分之一加六分之一加十二分之一加二十分之一加三十分之一
=1/(1X2)+1/(2X3)+1/(3X4)+1/(4X5)+1/(5X6)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1-1/6
=5/6

Answer 2

1/2+1/6+1/12+1/20+1/30=30/60+10/60+5/60+3/60+2/60=50/60=5/6

Answer 3

1/2+1/6+1/12+1/20+1/30 =6/12+2/12+1/12+3/60+2/60 =9/12+5/60 =9/12+1/12 =10/12 =5/6

Answer 4

六分之五

Answer 5

5/6