Question

六分之五减十二分之七加二十分之九减三十分之一加四十二分之十三等？

Answer 1

原式=5/6-7/12+9/20-1/30+13/42
=1/4+9/20-1/30+13/42
=7/10-1/30+13/42
=2/3+13/42
=41/42

Answer 2

六分之五减十二分之七加二十分之九减三十分之一加四十二分之十三
=5/6-7/12+9/20-1/30+13/42
=1/4+9/20-1/30+13/42
=7/10-1/30+13/42
=2/3+13/42
=28/42+13/42
=41/42

Answer 3

六分之五减十二分之七加二十分之九减三十分之十一加四十二分之十三
=1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7
=1/2+1/7
=9/14

Answer 4

四十二分之四十一