1. Calculate: $11.99 \times 73+1.09 \times 297+\frac{1}{2} \times\left(3^{2}-1^{2}\right)=$ $\qquad$
【Analysis】Original expression $=11 \times 1.09 \times 73+1.09 \times 11 \times 27+4=11 \times 1.09 \times 100+4=1199+4=1203$