Question

十五分之四除以（九分之十三减三分之二乘六分之五）加六分之五

Answer 1

4/15÷(13/9-2/3*5/6)+5/6

=4/15÷(13/9-5/9)+5/6

=4/15÷8/5+5/6

=4/15*5/8+5/6

=1/6+5/6

=1