23000=4600*（（（1-（1+i）^-9)/i)
    2 * x * ln ( x + 1 ) + ( x + 1 ) ^ -1 * x ^ 2 + 2 * ln ( x + 1 ) + 2 * ( x + 1 ) ^ -1 * x + ( x + 1 ) ^ -1 - 2 * x
    1/(2x*sqrt(1-2x^2))=10
    X+X*0.06=250000
    0.23x=x-673678.33+79530.21
    8^x-7^x=15
    2cosx=xsinx
    tanx=2/x
    2+x+2+x+2=10
    [sin(x+30)]/[(sinx)(sin70)]=(sin60)/[(sin20)(sin40)]
    [sin(x+30)]/[(sinx)(sin70)]=[sin60]/[(sin20)(sin40)]
    (sin(x+30))/(sinx)(sin70)=(sin(60))/(sin20)(sin40)
    X^2-0.25X-13/2=0
    x*x-16*x+64=0
    5x^2-28x-33
    5x^2-14x-33
    X^2+3x+9=0
    24x/30=1.2x+60
    16X^2-375x-625=0
    4.9338=（（28.02*0.639（x+0.1））/（1+0.639（x+0.1））*（（100-6.66-1.14）/100）*（1/(1+0.31*1.14）+（（0.76（x+0.1））/（1.3*0.101325））

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