(800-9213.15+x)*0.75/27000=12%
    (800-9213.5+x)*0.75/27000=12%
    (800-13330.88+x)*0.75/27000=12%
    (800-12168.93+x)*0.75/27000=5%
    (800-12168.93+x)*0.75/2700=5%
    .314*473.15/（V-7.3214）-33.9659/（473.156^0.5*V*（V-7.3214））=1.013*10^6
    5213.15+(800-12168.93+x)*0.75=5634.18
    5213.5+(800-12168.93+x)*0.75=5634.18
    X*1.61%=228
    1200000=1000*x*(1-250*x)*19*400*400+357*4*3.1415926*12.5*12.5
    x*(1-250*x)=0.05926
    x*(2000-250*x)=118.520
    250+(98/x) = 266
    250+98/x = 266
    401-(304/x) = 336
    227+(138/x )=242
    X（1-60%）-2500=1415
    （120000-110500-x）/120000*100%=10%
    12.9*x^2+0.7*x-3=0
    12.9*x^2-7.9*x-5=0

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