250000x^2-12000000x+829644000＜0
    -20x^2+500x+3000≥5000
    0.01x小于0.5x-100000小于0.05x
    1180-200x>440
    190≤x+14×60≤1600
    190≤x+15×60≤1600
    81 a^2+324 a- 1296≤0
    700000≤1/0.85*((1/1.7)*(0.4*1.43*250*2300-0.1*1000000)+0.8*360*x*2300)
    7x<60+x<8x
    (x^2)/2>sqrt(2x^2+2)
    -x^2-3x-4>0
    -x2-3x-4>0
    (1.12x+(1-x))*1.17>1.185
    (1.15x+(1-x))*1.145>1.18
    X²-3x+5>0
    abs(2x+1)+abs(x-2)<8
    (2a+2)²-4a(a+2)>0
    abs(x-1)+abs(2x-4)>3-x
    abs(xx-3x)<4
    1

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