（-1/2）^x
    15/(10000+y)=6/y
    y=4287+0.067÷y
    129360x+1193430000＝16.1×1600×0.9×138.75×(0.9x-0.45×138.75)
    129360x+1193430000＝16.1×1600×0.9×138.75×(0.9x-0.45×138.75)
    ((10x+10)-(20x+30)/(3x+6))x=5x+10
    ((10x+10)-(20x+30)/(3x+6))x=5x+10
    ((10x+10)-(20x+30)/(3x+6))x
    (100/3)(10cos(x)-5/cos(x))=(50cos(x)-10sin(x))(25sin(x))/cos(x)
    (100/3)(10cos(x)-5/cos(x))=(50cos(x)-10sin(x))(sin(x))/cos(x)
    (100/3)(10cos(x)-5/cos(x))=(50cos(x)-10sin(x))(5sin(x))/cos(x)
    134760x+1193430000＝16.1×1600×0.9×138.75×(0.9x-0.45×138.75)
    (100/3)(10cos(x)-5/cos(x))=(250cos(x)-50sin(x))(sin(x))/cos(x)
    (100/3)(10cos(x)-5/cos(x))=(250cos(x)-50sin(x))(5sin(x))/cos(x)
    (100/3)(10cos(x)-5/cos(x))=(250cos(x)-50sin(x))(sin(x))/cos(x)
    (100/3)(10cos(x)-5/cos(x))=(250cos(x)-50sin(x))(sin(x))/cos(x)
    76308x+861589440＝16.1×1500×0.9×126.46×(0.9x-0.45×126.46)
    76308000x+861589440＝16.1×1500×0.9×126.46×(0.9x-0.45×126.46)
    76.308x+861589440＝16.1×1500×0.9×126.46×(0.9x-0.45×126.46)
    c^2+2c-333=2

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