0.97025X^2+51.25X=0.3*100000
    {2x+5}+4=84
    0.026*(2+2*x)^(2/3)=1.59*x^(3/5)
    tanx－x=0.01
    √（2+√（4-x^2））-√（4-2x）＝√2/2
    0.97025X^2+51.25X=-0.3*100000
    3xx-6x-24
    0.97025X^2+51.25X=10000*0.3
    0.97025X^2+51.25X=10000*50
    (1.18-8.39*10^(-3)*25)X^2+(118-2.67*25)x-50*10^5=0
    (x^2+x+1)/(x^2+1)+(x^2+1)/(x^2+x+1)=13/6
    （1.18-8.39*10^(-2))X-(1.18*10^(-4))X^2+25*2.67*10^(-4)X+25*(8.39*10^(-7)X^2=0
    x^2-3x-2=0
    x=0.5*2.3*2*10^(-6)*((30-140000x)-1)^2*(1+(30-140000x)/50)
    x=0.5*2.3*2*(8.54384-1)^2*(1+8.54384/50)
    arctan（0.1x）＋arctan（0.001x）＝39
    x^2+x+2x√(x+2)=14
    (30-x)/0.14=0.5*2.3*2*(x-1)^2*(1+x/50)
    x^2+x-2=0
    51=90-arctan 0.1x-arctan 0.001x

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