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
    4X^（2）-3√10X+5=0
    434548.4=151881.6*(1/t+1/(t^2)+1/(t^3)+1/(t^4)+1/(t^5))
    434548.41=253136/(1+x)+253136/((1+x)^2)+(253136)/((1+x)^3)
    (t*(t^2-2*t+1))/(1-t)=(434548.41)/253136

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