3800x-5000（1+x）*8%*50%=0
    1-1/(1+(h/95/2)^2)^(3/2) = 1.732/2.019
    （13+1）/1.75=（1.1-x）/x（1.175-x）
    1/（d）+1/（d+1）+1/（d+4）＝1/（d+2）
    （3x+2）/5=1
    3x=1
    1-1/(1+(h/95/2)^2)^(3/2) = 0.874/0.88
    x/280+6000=（x+1000000）/240
    1-1/(1+(h/95/2)^2)^(3/2) = 0.808/0.88
    1-1/(1+(h/95/2)^2)^(3/2) = 0.075/1.895
    2.9438πx-sin（2πx）-0.3933π=0
    2.9438πx-sin2πx-0.3933π=0
    2.9438πx-sin（2πx）-0.3933π=0
    2.9438πx-sin2πx-0.3933π=0
    2.9438x-sin2πx-0.3933π=0
    log(x）＝4.8554
    2x^2+58x-2000=0
    1/x+1/（x+2）+1/（x+3）=1/（x+5）
    xx-3x-60=0
    x^2+29x-1000=0

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