（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
    -450+x-x*8%/4-690=500
    x/ln（x）
    1-2^a/1
    s(s^2+24s+144)=(s+20)((s+12)^2+2s(s+12))
    x^2+1/4*x^2=8
    5/4*x^2+2*x+8=2*sqrt(2)

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