1又1/3*【21÷(4又1/12-2.625)-4又1/2】÷3又3/5
=1又1/3*【21÷35/24-4又1/2】÷3又3/5
=1又1/3*【14.4-4又1/2】÷3又3/5
=1又1/3*9.9÷3又3/5
=13.2÷3.6
=11/3
=3又2/3