7∕16×12/35÷3/20
=1/4×3/5×20/3
=1
[7/8-(5/16-1/4)]÷26/27
=(14/16-5/16+4/16)×27/26
=13/16×27/26
=27/32
5×4×(1/5×3/4﹚
=20×3/20
=3