=2.7×0. 1

=0.27;

(2)32.8× 10.5÷2.5?

=32.8×( 10.5÷2.5)

=32.8×4.2

= 137.76;

(3) 18.34÷0.07-83.76

=262-83.76

= 178.24;

(4) 10. 1÷0.8÷0.25

= 10. 1÷(0.8×0.25)

= 10. 1÷0. 1

= 10 1;

(5)2 1.8÷( 1.25× 16)

=2 1.8÷( 1.25×8×2)

=2 1.8÷( 10×2)

=2 1.8÷20

= 1.09;

(6) 19.5÷0.4÷0.25

= 19.5÷(0.4×0.25)

= 19.5÷0. 1

= 195.