380=9x+1/2x^2
    5*sqrt((0.352x)^2+1)=x*sqrt(x^2+1)*sqrt((0.25x)^2+1)*sqrt((0.11x)^2+1)
    5*sqrt(7.97)=x*sqrt(x^2+1)*sqrt((0.25x)^2+1)
    2X+X+1=X+3+X+2
    5=(0.25*x)^2
    5*sqrt((1.036x)^2+1)=x*sqrt(x^2+1)*sqrt((0.25x)^2+1)*sqrt((0.074x)^2+1)
    x*3.6*sqrt(14)=1
    5*sqrt(14)=x*sqrt(x^2+1)*sqrt((0.25x)^2+1)
    0.3（x+4）=9
    3.14*(D^2-74^2)=600000*4*0.23
    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

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