(18+x)÷（48+x）=0.4
    385*22*180+（350-x）*385*8=385*12*180+x*8*385+700*150*6.5+2261.9*448
    0.36764047x^2-117.2988155x+15838.57776=0
    (X*92%)+(X*92%*6%)=1322934.29
    1/(d+1)+1/(d+2)+1/(d+5)=0
    20lgk=10
    0.527/（4.88-x）+1.469/（2.47-x）+0.261/（1-x）+0.027/（0.732-x）=0.2
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*308/x*0.35805183739485175）^0.05) = 17.05/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*254.1/x*0.35805183739485175）^0.05) = 8.81/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*263.3/x*0.35805183739485175）^0.05) = 9.16/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*266.9/x*0.35805183739485175）^0.05) = 11.29/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*252.3/x*0.35805183739485175）^0.05) = 9.35/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*243.2/x*0.35805183739485175）^0.05) = 8.56/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*274.7/x*0.35805183739485175）^0.05) = 9.85/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*277/x*0.35805183739485175）^0.05) = 9.78/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*241.4/x*0.35805183739485175）^0.05) = 8.19/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*261.1/x*0.35805183739485175）^0.05) = 12.69/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*289.2/x*0.35805183739485175）^0.05) = 11.33/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*229.1/x*0.35805183739485175）^0.05) = 6.89/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*348.1/x*0.35805183739485175）^0.05) = 23.14/x

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