x^2+20x+49=0
    sint+sin4t=0
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(100.6^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/100.6)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(37.6^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/37.6)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(129.7^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/129.7)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(152.3^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/152.3)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(174.12^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/174.12)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(192.3^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/192.3)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(215^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/215)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(239^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/239)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(30.55^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/30.55)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(262.38^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/262.38)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(57^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/57)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(309^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/309)^0.25)
    125%＝18000÷x－2
    （x+20)*【1.68:342+（20-x）：18】=(20-x)*【2.45:690+（20+x）：18】
    （x+20)*【0.0035+（20-x）：18】=(20-x)*【0.0049+（20+x）：18】
    -4/25x^2+4/5x+2=0
    x^2-6x+7
    x²-6x+7

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