√(6.25/61)
    √(6.25/61/1000000)
    10^-1.28/2.33
    (10^-5.92)/3.2*10^-4
    300000/8.314/298.15
    （8+9）7
    arccos-0.3733
    arcsin(0.672)
    arcsin(0.6767/0.94)
    arcsin(0.64/0.74)
    cos120
    2^100
    148*100/67/1/149*100=
    110*100/41/1/149*100=
    47*100/41/1/149*100=
    148*100/67/1/140*100=
    17725×0.5/4
    5*4*9*7
    42.81+147.81
    0.01*0.144552

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