x/(2-x)=0.025
    x/(2-x)=0.05
    （x－5）（x＋1）>0
    2x^3-9x^2-47x+84
    sin33
    x=5/exp(x*2)
    （x+1.5)/ln((40.5+1.5)/(40.5-x)) =32.061
    （x+1.5)/ln((40.5+1.5)/(40.5-x)) =35.267
    （x+1.5)/ln((40.5+1.5)/(40.5-x)) =39.889
    （x+1.5)/ln((40.5+1.5)/(40.5-x)) =40.56
    （x+1.5)/ln((40.5+1.5)/(40.5-x)) =41.23
    （x+1.5)/ln((40.5+1.5)/(40.5-x))=42.7
    x^(2)+2√5x+3=0
    x^(2)+1.99x-15.02
    35.52x^(2)+70.6848x-534.576
    1/5:2.5=2/15:x
    13=1.5/（x-1.5）^2
    (3x+9):(5x+9)=2:3
    x^2+2x+17=0
    (1+x+1/2x^2+1/6x^3+1/24x^4+1/120x^5+1/720x^6+1/5040x^7)*(3-x)-3=0

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