2x^2+3x≥0
    3x-5<10
    37x-5<10
    2x-4>0
     -4082750+3000000+x-x*10%/4-450000 ≥300000
    (4x+1)(3x+1)(2x+1)(x+1)>0
    (4x-1)(3x-1)(2x-1)(x-1)>0
    225*1/a+a小于5000 a大于0
    225*1/a+a小于5000
    m^2-4m^2+12>0
    e^x+1/{(e^x)+1}>1
    e^x+1/(e^x)+1>1
    abs（5x+1）<2-x
    26/26+x≤30%
    －2（1/3x－1/4x）+1≤x
    20（n-1)<12n+10
    20（n-1)<12n+10<20n
     6x+5-sqrt((6x+5)^2-4(6x+4))≥0
     6x+5+sqrt((6x+5)^2-4(6x+4))≥0
    (x+1)/(4-2x)<1^-1

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