乘除优先，加减滞后。先计算6.8×16.8和17.3×3.2，再将两者的乘积相加。6.8×16.8+17.3×3.2 =114.24+55.36 =169.6
6.8×16.8+17.3×3.2=114.24+55.36=169.6
