26.16=0.00002*x^2+0.0127*x+24.333
    arctan(0.2*X)+arctan(0.5*x)=90
    0.6x+90+60=1.4xX（0.4x+90+60）
    1630*i1-510*i2=6 1840*i2-510*i1=12
    0.000571x^2+0.00000742x-0.000000131=100
    49x^(2)+84x+36=0
    1-1/(1+i)^10=233.35i
    x^-1+1-(x+1)/x*(e^x)=0
    10lg(10^2.81+10^3.47)
    x^4-12*x^2+16*x-1=0
    10lg(10^2.81+10^5.84)
    (1-228.43x)(1+x)^10=1
    1-1/（1+i）^10=228.43i
    x*sqrt(x^2+1)sqrt(x^2/16+1)=5
    x*sqrt(x^2+1)sqrt(x^2/8+1)=5
    arctana+arctan(0.25a)=39
    （20-x）*(20-x)/40-x*(20-x)/20=0
    3S^2+6S+2=0
    10lg(10^3.72+10^2.67)-10lg2
    0.4692/（1+1.38x）-0.0092/（1-0.04x）-0.237/(1-0.29x)

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