（3*2）X=（505-55）
    15/(7.5*sqrt(7.5^2+1))=1/(sqrt(x))
    15/(x*sqrt(x^2+1))=1/(sqrt(3.69))
    15=x*sqrt(x^2+1)
    x²-6x+9=（5-2x）²
    x²-3x+2=10
    （2x-1）²=（3-x）²
    lg(x/(0.0001-2x)^2)=14.875
    (2x-0.5)^2/(0.5-x)=10^19.168
    lg((2x-0.5)^2/(0.5-x))=19.168
    3.14*(D^2-74^2)=275000*0.35
    3.14*(D^2-74^2)=275000*0.38
    x²+2√5+10＝0
    3.14*(500^2-74^2)=X*4*0.35
    3.14*(D^2-74^2)=252500*0.38
    3.14*(D^2-74^2)=25250*4*0.38
    3.14*(D^2-74^2)=25250*4*0.38
    140*0.45+0.55x=129
    1.055x*1.025+1.0975（400000-x）=435775
    4Y-2Y=1.2

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