(3.9+3又7分之3+6.09+6又7分之4)×(2又8分之1-1.25)+(1÷3分之2-1.5)×6.04
=(3.9+3+6.09+6+1)×(17/8-9/4)+(3/2-3/2)×6.04
=19.99×(-1/8)+0
=-1999/800
=-2又399/800
(3.9+3又7分之3+6.09+6又7分之4)×(2又8分之1-1.25)+(1÷3分之2-1.5)×6.04
=(3.9+3+6.09+6+1)×(17/8-9/4)+(3/2-3/2)×6.04
=19.99×(-1/8)+0
=-1999/800
=-2又399/800