-2x²-x+3≤0
    -2x+x≤-3
    X²-3x+4＞0
    (1-0.3) ^x<0.2
    1*(1-0.3) ^x<0.02
    abs(x-3)+abs(x+4)≥9
    -16X²+8X-1≤0
    2x+3>7
    x-2<7
    -2x-3>5
    1-y<=(y+3)/2-1
    2sin(x+30）>0
    x^2-6x+9≥0
    x^2+6x-9≥0
    x^2-x+¼＞0
    sin(7x)*sin(x)>1/4
    3-x/(2x+1)≥1
    X2-25X-300≥0
    (2x-1)/3-(9x+2)/6≤1
    0.005x²+0.05x-10＞0

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