18.16×0.6=
    34387867685243375*3438980564943
    37^(1/3)
    307.68×5554.54/32240
    1/12×1.15×(45-1.8×2-1.35×2)^3
    1/12×1.15×(450-18×2-13.5×2)^3
    8/(4/5)
    2700×205
    8/(4/5)
    1836×205×(1-2/8)
    18×150-18×24×2
    -18297*4.14/（-1.112*74.5）-200*4.2-4.14*0.67
    -18.297*4.14/（-1.112*74.5）-200*4.2-4.14*0.67=
    43.16×0.60=
    31.5×0.60=
    11-4√3 4/3*3.1415926535
    11-4√3 4/3*pi
    11-4√3
    arccos 0.7696
    arccos 0.7696

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