(x^2)*ln(0.8*3.342/4.074/x)/((1-x)^2)/ln(0.2*3.342/47.97/(1-x))
    x^2*ln(0.8*3.342/4.074/x)/(1-x)^2/ln(0.2*3.342/47.97/(1-x))
    1.6(1+X)(1+x)=2.5
    1.6（1+x）（1+x）=2.5
    xx+2x-0.25=0
    (X^2*ln(0.6*7.798/47.97/X))/(1-X)^2/ln(0.4*7.798/4.074/(1-X))=1
    (X^2*ln(0.8*11.48/47.97/X))/(1-X)^2/ln(0.2*11.48/4.074/(1-X))=1
    (X^2*ln(0.2*31.48/4.074/X))/(1-X)^2/ln(0.8*31.48/47.97/(1-X))=1
    a^5+a^4+a^3+a^2+a+1=0
    （10+x）（600-10x）=10000
    20x^2-91x-45=0
    sin2x-2x=-3. 768
    100（1+x）（1+x）=144
    （5+x）（200-10x）=1500
    10（1+x）（1+x）=12.1
    （44-x）（20+5x）=1600
    100（1+x）（1+x）=121
    Y=100+0.9*（Y-0.2*Y）+300+300
    t（6-t）=8
    A*A+A=600

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