90-atan(10)-atan(0.2)
    3.151/3×(2×14.58+57.535)/(14.58+57.535)
    1/2×(14.58+57.535)×3.151
    14.58+13.6323×3.151
    (5.05*7.81+13.92*4.93+379.97*1.89-57.39*0.61)/6.4
    256.900×6.270
    198.050 ×6.270
    25000+23000+25800+32500+36000+65000+46400+3200
    24*150
    8×6300-8×500=
    8×6900-8×500+2×6900=
    54000-8×500-8×1000-6000=
    54000-9×500-8×1000-2×1500=
    （15900-3×500-1500）×2
    54000-8×500-18×1500
    54000-10×500-14×1500-1500×2=
    atan(0.77*3)+atan(3.33*3)-atan(0.144*3)-atan(0.1*3)-atan(3)-atan(36.67*3)-90
    454.296/98
    (2×16+0.8×9.8)×11.403
    20*lg(42.8*0.77/3)

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