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    3x²-40x+175=0
    x^4+4×x^3+12×x^2+32×x+16=0
    3x²-20x+16=0
    3x²-20x+16=0
    (25+x)/(51+x)=0.55
    5.3413=((30.56*0.847(x+0.1))/(1+0.847(x+0.1))*((100-8.28-1.4)/100)*(1/(1+0.31*1.4)+((2.26(x+0.1))/(1.3*0.101325))
    5.2732=((30.56*0.847(x+0.1))/(1+0.847(x+0.1))*((100-8.28-1.4)/100)*(1/(1+0.31*1.4)+((2.26(x+0.1))/(1.3*0.101325))
    lnx-2x+1=(-x)/(x+1)+ln(x+1)
    π*(D^2-74^2)=3000000*4*0.041
    π*(D^2-74^2)=3000000*4*0.033
    π*(D^2-74^2)=3000000*4*0.042
    π*(D^2-74^2)=2000000*4*0.042
    -x^2+2x+2=0
    16x^2(2+4x^2)-4(1+2x^2)8x^2=0
    9(-x+2)^2=6(2+x^2/4)
    9(-x+2)^2=6(2+x^2/4)
    X/1.13=9734.513
    ((10^-3)-x)10^-4.78=x^2
    (10^-3-x)10^-4.78=x^2
    10^-4.78=x^2/((10^-3)-x)

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