(x*10^9)/((25-x)*(12.5-x))=1.83*10^6
    (x*10^9)/((25-x)*(50-x))=1.83*10^6
    (x*10^9)/((100-x)*(50-x))=1.83*10^6
    (x*10^9)/((200-x)*(100-x))=1.83*10^6
    (x*10^9)/((12.5-x)*(25-x))=10^7
    (x*10^9)/((25-x)*(50-x))=10^7
    (x*10^9)/((100-x)*(200-x))=10^7
    (x*10^9)/((50-x)*(100-x))=10^7
    (x-146.066)*10-2=1
    (x*10^9)/((100-x)*(200-x))=430
    16x^4-8x^3-16x^2+8x+1=0
    5x²+4x=-5
    0.4x+2=0.046（1.06x+8）
    （2x+81.4）*1.08-2x-100.99＝0
    10000/x+40800/（x+60）=150
    10000/x+30800/（x+60）=150
    x^2+0.5x-0.75=0
    (x-145.835)*10-2=1
    (x*(1-x^10))/(1-x)=113850/(16891.2)
    8*(1+x)^2=11.52

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