75%3p/8=25.8
    3p/875%=25.8
    (100-x)*(50-x)*(-10-x)-48000-400*(50-x)+1600*(10+x)-900*(100-x)=0
    x=0.08/(1+0.08)+0.16/1.08^2+0.24/1.08^3+4.32/1.08^4
    x=0.08/(1+0.08)+0.16/1.08^2+0.24/1.08^3+0.32/1.08^4
    0.1x^2-60x+5000=0
    (100-x)(50-x)(-10-x)-24000-24000-400(50-x)-1600(-10-x)-900(100-x)=0
    1261.74=13.8*10^3*{0.18X(1.095-X/2)+(1.58-0.18)*0.12*(1.095-0.12/2)}
    x^2-60x+5000=0
    b^2=（-√3+2×0.815^2）/2
    b^2=-√3+2×0.815^2/2
    518647500x*x-8264025x+5.3361=0
    41000000000x^(2)+x＝0.025
    41000000000×x^(2)＝0.025-x
    41000000000x^(2)＝0.025-x
    -3x^2+10x+10=0
    245.2/(93.72x+6.28)+525/(98.164x+1.836)+42/(93.72x+6.28)+55.64/(76x+24)=40
    245.2/(93.72x+6.28)+525/(98.164x+1.836)+42/(93.72x+6.28)+55.64/(76x+24)=30
    -3x+10x+10=0
    245.2/(93.72x+6.28)+525/(98.164x+1.836)+42/(93.72x+6.28)+55.64/(76x+24)=25

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