3.14*(600^2-74^2)=X*4*0.042
    3.14*(D^2-74^2)=1200000*4*0.042
    3.14*(600^2-74^2)=X*4*0.23
    3.14*(D^2-74^2)=2000000*4*0.042
    0.2=2.7*500/200/x*0.6029*(1.9*40+0.08*25*400*400/x)
    x=1
    3.14*(670*670-74*74)=1485000*4*X
    x*0.9+(5000-x)*0.21=5000*0.35
    x*0.8+(5000-x)*0.21=5000*0.35
    1/(y+2)=1
    1/(y+1)=1
    1/y+1=1
    0.0677*x^2-56.292*x+12925
    e^（x+1）+e^（-x）-e-1=0
    x^2-2x-1=0
    x*99.975%-135.025*100.025%=1/10
    X(5-X) = 4
    X(5-X) = 7
     (12-2X)(8-X) = 48
    (12-X)(8-X)=48

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