（3-4）x<=4-3
    10x-3<1
    1/7(8-2x)-(3x-1)/5＜4
    （x^2-18x-40）/5（100-5x）≤0.8
    2+[3（y+1）/8]＜3-[（y-1）/4]
    （x^2-18x-40）/5≤0.8
    3-（x-2）/2＜（1/6）x
    x^2-18x-40≥240
     abs2x-2>6
    (1-3x)/2≤(2x+1)/5-1
    -5x＜-5
    12>(2+2+1.5+2+1.5+2+1.5+1.5+2)/(1+X%)
    12>(2+2+1.5+2+1.5+2+1.5+2)/(1+X%)
    0.25π<=x<=2.25π sinx>=cosx
    sinx>=cosx
    3/1+ x> x-1
    99e-e2-25*49＞0
    3-（x-2）/2<=1/6x
    (155.7*n+18.19*n*n)*(155.7*3+36.38*n)/(155.7*2+36.38n)*n/3-1212.32-577.07*n>1.2*(238.26*n+6.89*n*n)*(238.26*3+13.77*n)/(238.26*2+13.77*n)*n/3
    （0.4x-1）/0.5-（5-x）/2≤（0.03-0.02x）/0.1

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