x<85
    x-64=24
    x+64=40
    -(x/2)-(((x^2-104)^0.5)/2)>0
    3000+20x-0.1x^2<25000x
    300+20x-0.1x^2<25000x
    8700-8700+x =x
    e^((-a*3.14)/(1-a^2)^0.5)=0.2
    1-x*x>x-1
    -9/60+h＞2.43
    -144/60+h≤0
    x^2-3.949x+7.25>0
    280x-x×x=2700
    （x+20）（300-x） = 8700
    2.3 - x - 0.45 * ( sqrt ( 0.9 + x ) - sqrt ( 0.9 ) ) >0
    2.3-x-0.45(sqrt(0.9+x)-sqrt(0.9))>0
    M*30*36%*70%=40000+M *30*6%
    20－x＝8
    1/2×x(x+1)＜2001
    4x^2+5x+9＞0

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