15.6÷【32×（1-5/8）÷3.6】
=15.6÷(32×3/8÷3.6)
=15.6÷[32×1/8÷(3.6÷3)]
=15.6÷(4÷1.2)
=15.6×(1.2÷4)
=15.6×0.3
=4.68