4m^2-10m+6<0
    x+3>=7
    a+8<0
    8a<0
    a^2+8a<0
    19405*x*x*x+9443*x>=1027.01
    26632*x+19405*x*x*x>=1879.19
    3(x+2)-8>1-2(x-1) 3x-1>2x+1 2-5x>8-2x 4(3x-1)<5(2x+1) 2x+3>6-x -3(x-1)>(x+4)-1
     5x-12<2(4x-3)
    -2x+5-1<3
    x+17<5x
    17x-x^3≤8
    26700+a-a*0.1/12*3≥50000
    Q*(150-90)*0.8+(8000*(150-90)+(Q-8000)*(20-90))*0.1+(10000*(150-90)+(Q-10000)*(20-90))*0.1 >558000
    Q*(150-90)*0.8+ (8000*(150-90)+(Q-8000)*(20-90))*0.1 + (10000*(150-90)+(Q-10000)*(20-90))*0.1 > 558000
    Q*(150-90)*0.9 + (8000*(150-90)+(Q-8000)*(20-90))*0.1 <= 558000
    2^x+2^（-x）>=4
    0<(-x^2+2x+3)/(sqrt(x^2+1)*sqrt(5x^2+12x+9))<1
    x<3x+4
    x^2+3x>100

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