x2^-x/2＞1
    2（2x-1）-3(3x-2)≤6
    (x+5)/2-1<=(3x+2)/2 (y+1)/3-(y-1)/2>=(y-1)/6 2(3x-1)-3(4x+5)>x-4(x-7) 3(x-2(x-1))<=4x
    -7≤2x-1≤7
    x^2-x-6≥0
    （x-7)^2<=1/4
    （x-7)^2>0
    ((2000-50*x)/2.5*x^(1/2))>=1.645
    x-1<0 x+2>=0
    x-1<0
    x/(1000-x) > 0.3
    100－y≥2/3y
    3x+8-5(x-1)＜5
    -2x+6≥4
    1 - !(26280) / ( 26280 ^ x ) / !( 26280 - x ) <0.005
    1-!(72)/(72^x)/!(72-x)<0.005
    （5a＋2）（－4a＋2）（－3a＋2）＜0
    －m^2－6m－10＞0
    －m^2－8m－6＞0
    4x^2-2>0

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