x^2+6x-1=0
    (18-3x)*(6-2x)=60
    (18-3x)*(6-x)=60
    4^x/（2+4^x）
    x+2x^2*sin(1/x)
    -2*x^2+35*x-300=0
    x*0.9^5*0.99^150*0.999^2115=1000000
    2000000000*0.9^(x/365)*0.99^(x/12)*0.999^x=1000000
    1400000000*0.9^(x/365)*0.99^(x/12)*0.999^x=1000000
    x^2-21x=0
    x^2-21x+900=0
    2^x^-1
    9x^2-3x-2
    xln（x-1）-2x
    x+25%x=370000
    2xx-5x+3=0
    3x（x-2）=x-2
    3x-50=850 4y=800
    3x-50=425 4y=425
    19492.33={x-468000}*12%

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