a/2.5(1+ln(a+3)/a)=(38-a)(44+a)/(284-5a)
    a/2.5(1+ln(a+3)/a)=(38-a)(44+a)/284-5a
    x-9=10
    x^2-4
    (1+0.5)*x÷2+(1+0.4)*(500-x)*0.9 =120
    （5-x）（5-x）+5.76=16
    39=11n*0.78^n
    X^2+X-96=0
     x^4-3.1*x^3+961/400*x^2+3.6*x-1.8^2=0
    x^4-3.1*x^3+961/400*x^2+4.6*x-2.3^2=0
    x^4-2*sqrt(3)*x^3+3*x^2-8/sqrt(3)*x+8/3=0
    x^4-3.1*x^3+1361/400*x^2+x-2.3=0
    x^4-2*sqrt(3)*x^3+3*x^2-8/sqrt(3)*x+8/3=0
    3x^2-28x+45=0
    X+5=95
    (80-x+10)/3+x/4*6=100
    (80-x+10)÷3+x÷4x6=100，
    （x-40）×[200-2x]=68
    （x-40）×[200-2x]=88
    1/3^x

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