-x>2*1
    3x>2x+1
    x^2-6x+3<0
    42.58(30-x)+60x>1500
    42.58(30-x)+55x>1500
    10800×（1+a％）×1440≥10800×（1+20%）
    k^2>=16 k<5 k>-5
    k^2>=16 k<>5 k>-5
    k^2>=16
    k^2=16
    2(x-3)+1≥5x
    19600+(X-400000)*0.0466>30960
    2(2x-1)-3(5x+1)≤6
    46800+(X-600000)*0.0741>19600+(X-400000)*0.0466
    30960+（X-720000）*0.04085>19600+(X-400000)*0.0466
    tan(180-2x)>0.5
    x^2-4x+4-4x^2-12x-20>0
    x-0.025x=23300
    80a-50（80-a）≤4520
    -tan(2*x)>0.5

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