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））
    4*x^2-9*x+3=0
    X*（1500-330）-500=0
    (2+2*x)^2/((2-x)*(3-3*x)^3)=4/27
    X^2+3x-1=0
    x*0.975*0.95=3000
    t^2+9t-23=0
    （5-x）:（3-x）=9:7
    x/2=3*x+5
    x-5/6+3/18=7/9
    x-6/5+18/3=9/7
    (x-125)/x＝0.15
    0.12x等于135
    x^3+x^2-x-(3-2*sqrt5)/8=0
    x^3+x^2-x-(3-2*sqrt(5))/8=0
    x^3+x^2-x-3/8+sqrt(5)/8=0
    x^3+x^2-x-3/8-sqrt(5)/8=0

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