【3.71/33.761+(2/1+5/1)*(8/13-56/19)】*18.2除以(2/1+3/1+4/1)
=【91+0.7×7/9】×18.2÷12/13
=【91+0.9】×18.2×13/12
=91.9×16.8
=1543.92