x/340-x/1500＜0.1
    x^2+2x+9大于0
    31.3＋C－C×6%×3/12≥50
    x^2-x-12<0
    3x≥2
    (3x-3)(2x+1)<=0
    (x-1)/x-2>1
    x^2-2>=3x^2-2x+10
    （2x-3）（3x+1）<=0
    (x-1)²(x+3)<0
    ln ( 3 * x + 4 ) ≥0
    -194*x^8-15936*x^7-323548*x^6-778432*x^5-7871810*x^4+1172096*x^3+579424*x^2+8192*x+2048<0
    long2 *5 >long2 *3
    0.492/[(50+6.8x)/(90+15.3x)]>0.508/[(40+8.5x)/(90+15.3x)]
    4/x+x<=4
    x^2+10x-1500<0
    0.005x^2+0.05x-12<0
    1-x<>0
    x^2-16<0
    x^2-4x+3<=0

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