20*lg(250/1250/1.39/1.39)
    0.417/3×(2×86.419+92.898)/(86.419+92.898)
    1/2×(86.419+92.898)×0.417
    86.419+15.5366×0.417
    90-atan(2.15)-atan(2.15*0.5)
    (sin(55)+1)/(1-sin(55))
    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

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