9.5×(6+t)^2×0.271×[2/3×(6+t)-1]=3.690×9.5t^2×(5+2/3×t)
    0.34*（1-2.38）/（1+1.38x）+0.23*（1-0.96）/（1-0.04x）+0.3*（1-0.41）/（1-0.59x）=0
    0.98^22
    0.01x^6+1.01x^4+x^2-400=0
    0.12:x=4:15
    0.34*（1-2.46）/（1+1.46x）+0.23*（1-0.97）/（1-0.03x）+0.3*（1-0.41）/（1-0.59x）=0
    0.34*（1-2.46）/（1+1.46x）+0.23*（1-0.97）/（1-0.03x）+0.3*（1-0.41）/（1-0.57x）=0
    1.698705*0.233847/(1+1.698705x)+0.117233*0.232825/(1+0.117233x)-0.512086*0.533327/(1-0.512086x)=0
    0.01x^6+1.01x^4+x^2-25=0
    0.985^27
    0.34*（1-2.46）/（1+1.46x）+0.23*0.97/（1-0.03x）+0.3+0.41/（1-0.57x）=0
    t^3+18t^2+76.388t+59.90=0
    （4.176+2.044）*（0.125*x+4.176）=0.125*x*4.176
    (151.02×10^3×836400)/(322000000×11.5)
    0.985^15
    (186.92×10^6)/1431111.11
    （2.126+3.388）*（2*0.881）=0.059*x+3.388-sqrt（（0.059*43.26）^2-（4*x*0.059*0.881*3.388））
    x÷20+20＝400
    sqrt0.664=0.985
    （2.126+3.388）/（2*0.881）=0.059*x+3.388-sqrt（（0.059*43.26）^2-（4*x*0.059*0.881*3.388））

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