-2.4296x^5+66.8872x^4-711.4745x^3+3753.6011x^2-9421.7066x+8928.2513 = 500
    -2.4296 x^5 + 66.8872 x^4- 711.4745 x^3 + 3753.6011 x^2 - 9421.7066 x + 8928.2513 =250
     -2.4 { x }^{ 5 } +66.9 { x }^{ 4 } -711.5 { x }^{ 3 } +3753.6 { x }^{ 2 } -9421.7x+8928.3 = 250
    arctanx+arctan0.5x=90
    10lgr+0.0025r=80
    20lgr+0.0025r=80
    10lgr+0.0003r=80
    20lgr+0.0003r=80
    10lgr+0.0003r=80
    10lgr+0.0025r=80
    x^0.85=8.7
    25x^4-12250x^2+100000＝0
    339.8256h^2-5520.861688h-22599.67514=0
    (x-1200)*0.75/325=(x-2040)*0.75/200
    （0.07x/1.05）-x+340000=0
    x^2+79100x－2160000=0
    x^2+79100x－2160000=0
    3x*x+24x+20=0
    3s^4+98s^3+1070s^2+4000s+4000＝0
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=1900000

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