0.0410x-0.0007x^2=0
    0.95*4/(0.052^2+0.044^2)^0.5
    x^2+60x-50=0
    985x^2+3.875x-996.125=0
    3.1415926535^2*210*10^9/96^2*3.1415926535*0.075^2/4/120000
    3.1415926535^2*210*10^9/96^2*3.1415926535*0.075^2/4/120
    24（1-1/3a）（1+2/5a)-16(1+2/5a)=800
    3.1415926535^2*210*10^9/96^2*3.1415926535*0.075^2/4
    5a^2-3a+18=0
    3.1415926535^2*210*10^9/96^2
    1.8*4/0.075
    x^4+2x^3-3x^2-3*x+4=0
    0=-2.4*10^(-11)*x^3+4.8*10^(-7)*x^2-0.0034*x+8.8
    2400=80(23-x)+80*0.95x+0.85*80x
    985x^2-70x-1070=0
    1500×X=1200X×（6-X）
    0=-2.4*10^(-11)*x^3+4.7*10^(-7)*x^2-0.0032*x+8.2
    1500X=1200X（6-X）
    y =( 1/e(-.1382))*(1+5/(-1.382))
    x^2-170x+2025

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