Question

1/5÷（2/3+1/5）×15

这题的结果是1/65，还是13/45 ，我和儿子算的不一样，哪个是对的呀

Answer 1

1/5÷（2/3+1/5)×15
=1/5÷13/15×15
=1/5×15/13×15
=3/13×15
=45/13（也就是十三分之四十五 )

Answer 2

1/5)/(2/3+1/5)x15

=1/5x15/13x15

=1/65

Answer 3

13/45