0.001x^2+0.11x-1=0
    200/39=166.7*x^2/(7x^2-1)^2.5
    200/39=166.7*x/(7x-1)^2.5
    63x^(2)+84.4x+22.69=0
    (77/1.64)*(0.5-（X^2)/(2*120^2)+ln(X/62.13)+(260/1339)*(0.4*ln(X/62.13)+0.3+(X^2/(2*69.85^2)))) = 0
    (77/1.64)*(0.5-（X^2)/(2*120^2)+ln(X/62.13)+(260000/1339)*(0.4*ln(X/62.13)+0.3+(X^2/(2*69.85^2)))) = 0
    3(X*0.4)=14.4+0.3*X
    1937.66*x^2+3775.32*x-262.34=0
    1.01^60
    X-X+1/2=1/3
    2 = v*v/2/9.81+0.0654/v*15/0.012*v*v/2/9.81
    2 = v*v/2/9.81+0.0654/v*0.01*15/0.012*v*v/2/9.81
    10+12x^(2)-21x-x^(3)=0
    3（x0.4）=14.1+0.3x
    5x^3-13x=154
    (2x-1)/3-(5x+1)/2≤1 (x+2)/2≥(2x-1)/3
    2 = v*v/2/9.81+64/815.8/v/0.012*0.01*15/0.012*v*v/2/9.81
    2=v*v/2/9.81+0.06*15/0.012*v*v/2/9.81
    5(x-2)+8<6(x-1)+7 5-2(x-3)>6x-4
    1-x-3/2x+2=3x/x+1

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