arccos0.91612
    2/35÷3/7×2/15
    (3/8-1/4)÷(8/9×3/4)
    -8*3^5+2^6
    87+9
    120-24
    12/0.85
     (20+18.8×2.2+18.8×6)×3.54+2×0×√0.28
    (20+18.8×2.2)×3.54+2×0×√0.28
     (20+18.8×2.2)×2.04+2×17×√2.04
    20×2.04+2×17×√2.04
    39*25-25*19
    254.89×5.4-1/2×（-33.31）×0.33×5.42-1/6×22×0.33×5.43
    （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

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