（19.8*1.61+20*1.3+22*0.21）*3+2*19.4*1.73
    (20+19.4*1.79+19.2*2.9+19.8*3.4+20*1.3+22*0.21)*0.33-2*20*0.58
    (22*0.2)/2*（2/3*0.2）+(（57.13+80.33）*3.1)/2*[2/3*3.1*(2*57.13+80.33)/(57.13+80.33)+1.1]
    (24*0.2)/2*（2/3*0.2）+(（38.73+61.49）*3.1)/2*[2/3*3.1*(2*38.73+61.49)/(38.73+61.49)+1.1]
    (24*0.2)/2*（2/3*0.2）+(（（37.63）+57.79）*3.1)/2*[2/3*3.1*(2*（37.63）+57.79)/(（37.63） +57.79)+1.1]
    （19.8*1.61+20*1.3+22*5）*3+2*19.4*1.73
    （19.8*1.61+20*1.3+22*5）*2.07+2*19.4*1.44
    （12/13）^23
    （12/13）^14
    237.08×9.7-1/2×（-33.51）×0.52×9.72-1/6×22×0.52×9.73
    (20+19.4*1.70)*0.6-2*42.4*0.77
    (20+17.5×1.6)0.76-2×10×0.87
    (20+19.4*1.7+19.2*3.10)*0.61-2*31*0.87
    (20+19.4*1.7+19.2*3.10+19.8*1.5)*0.61-2*31*0.87
    (20+19.4*1.7+19.2*3.1+19.8*3+20*2.5+22×1.8+24×1.3)*0.217-2*25* 0.4663
    （19.8*1.5+20*2.5+22*1.8+24*1.2）*4.60+2*19.4*2.14
    （19.8*1.5+20*2.5+22*1.8+24*2.9）*4.59890+2*19.4*2.14450
    （20+19.4*1.7+19.2*3.1+19.8*3+20*2.5）*1.91+2*19.4*1.38
    （20+19.4*1.7+19.2*3.1+19.8*3+20*2.5+22×1.8+24×4.5）×4.5989+2*24*2.14
    (19.2*0.2)/2*（2/3*0.2）+(（（37.63）+57.79）*3.1)/2*[2/3*3.1*(2*（37.63）+57.79)/(（37.63）+57.79)+1.1]

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