x=4×10^（-3）×（1-（15-x×（7000））/4）^2
    4X+1/4X+3=4/3
    x+16=2x-21
     4X+1/4X+3
    x^2*(82.36-0.5x)/[(0.24-x)^2*(7.52-x)]=10000
     x/{(0.24-x)*[[(7.52-0.5x)/(82.36-0.5x)]^0.5]} = 100
    (160+40(38-x))(x-22)＝3640
    1500-1500/(5.6*x)*0.2*x-5.4*x=0
    x/{(0.24-x)*[(7.52-0.5x)/(82.36-0.5x)]^0.5} = 100
    1500-1500/(5.6*x)*0.2*x=5.4*x
    x/{(0.24-x)[(7.52-0.5x)/(82.36-0.5x)]^0.5} = 100
     x^2/{(0.24-x)[(7.52-0.5x)/(82.36-0.5x)]^(1/2)} = 100
     x^2/{(0.24-x)[(7.52-x)/(82.36-x)]^(1/2)} = 100
    1000-1000/(5.6*x)*0.2*x=5.4*x
    x^2/{(0.24-x)^2*[(7.52-x)/(82.36-x)]^(1/2)}=100
    -x²/1-x²
    m^2-4*m+40
    1000-(1000/5.6*x)*0.2*x=5.4*x
    X-X*（1-0.2）*0.2=4000
    x²-150x+6000=0

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