Question

简便计算;9分之1÷[(5分之1+3分之2)×3分之1]

Answer 1

1/9÷[(1/5+2/3)×1/3]
=1/9÷1/3÷(3/15+10/15)
=1/3÷13/15
=1/3×15/13
=5/13