140>7/(0.075-r)
    140>7/(0.075-r)
    -1／x-x≥0
    9*x^2-12*x+4>0
    -2*x^2+x+1<0
    -x^2+7*x>6
    (2x+4)^2-4(x+2)(3x+3)>=0 -2
    4x^2-4(2x+1)(x-1)>=0 (x-1)/(2x+1)<0
    9x^2-4x(x-3)>=0 (x-3)/x<0
    9x^2-4x(x-3)>=0 (x-3)/x>0
    2x^2+x+1>=0
    9.8*（cos(0.785-x)-0.3sin(0.785-x)）+0.007>0
    cos(0.785-x)-0.3sin(0.785-x)+0.007>0
    -0.3sin(0.785398-x)+cos(0.785398-x)+0.007>0
    36x
    5455565566x<64
    4x+10大于等于8
    x^2<25
    25-24*e(-5*T)-50*T*e(-5*T)＜1
    25-24*e(-2*T)-50*T*e(-2*T)＜1

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