6/x<-1
    x/6<－1
    12a+10(10-a)<=105
    37500<=650m+400(75-m)<=38500
    80m+30(30-m)<=1700
    -9/x+3*ln（3/x）＞-6
    100＋14×（x－50）＜18x
    1.5-x>1 1.5-x<2
    150（0.9x-4）+120（x-5）≥420
    35x＋25（40－x）≤1100
    1.498*10^9<((6.35+0.01x)*(0.99x-6.35)^3)/x
    1.498<((6.35+0.01x)*(0.99x-6.35)^3)/x
    3-x-2x^2＞0
    2／x－3＜3／2x－5 ＋1
    0
    0
    m+sqrt(4m^2-10m+4)>0 m+sqrt(4m^2-10m+4)<1 m-sqrt(4m^2-10m+4)<0
    m-sqrt(4m^2-10m+4)>=1 4m^2-10m+4>0
    m-sqrt(4m^2-10m+4)>1
    (x+50*0.98)/(50+x)>=0.99

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