xx-4x＞0
    2x+10>3x
    5/10×（50x+450-30x）≤255
    2xlnx+(（(x^2)-1）/x)-2x+2>0
    2xlnx+(（(x^2)-1）/x)-2x+2<0
    x^4-4x^3+3x^2＜0
    x^4-4x^3+3x^2>0
    10x-7＜3x+21
    2（x-5）-1>6
    2x>5
    570*x+50980.5*x/1298+570*x*0.1%+570*x*0.1%+1987.909+(628.254*x+16078.55*x/1298+2186.6999)*0.00968/0.99032<3000000
    570*x+50980.5*x/1298+570*x*0.1%+570*x*0.1%+1987.909+(628.254*x+16078.55*x/1298+2186.6999)*1.1*0.88%<3000000
    570*x+50980.5*x/1298+570*x*0.1%+570*x*0.1%+1987.909+(628.254*x+16078.55*x/1298+2186.6999)*0.88%<3000000
    3x+4>-2
     (4200/30)x＋1800/(30—(x—30))＜3000/x
    (21+d)(21+4d)<(21+11d)
    0.9≤（1-x)^100
    -50-（100+X）*1%+X≥10
    9+4a≥0
    x^2-1160x+81683≤0

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