-4-2t+（20-10t）÷2=0
    80x-2400x/（150-x）
    80x-2400x/150-x
    x*x = (0.01-x)*0.0001584893192
    x*x=(0.01-x)*10^-3.8
    34x+x×x＝17750
    2a^3-9a^2+18=0
    2a3-9a2+18=0
    （100×x）×0.19+（100×x）＝50000
    x*(x+0.00000005)=0.00000000000001
    (0.1+x)*x=0.01*(0.1-x)
    x（x+1）=144
    2x－0.4x＝6－8
    2x－0.4x＝－2
    x²+700x=720
    113*x*sqrt(1-x^2)=4
    (113*x*sqrt(1-x^2))=4
    x = 4/(113*sqrt(1-x^2))
    arctan(3^0.5*x/(2-x))+arctan(3^0.5*x/(4-x))=π/3
    x*x+1/x

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