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加四十二分之一等于多少

要有详细解题过程

Answer 1

=(1/2+1/6)+1/12+(1/20+1/30)+1/42
=(6+2)/12+1/12+(3+2)/60+1/42
=9/12+5/60+1/42
=45/60+5/60+1/42
=5/6+1/42
=（35+1）/42
=36/42
=6/7