2x^2-7x≤x^2-12
    2x=60
    (X+3)(x-1)>-3
    （0.44-0.0167x）sin（200.404/（15-0.3x））-0.1174x=1.74688
    1/2X^(2)-3x+5
    1/2X^(2)-3x+5>0
    7/1-6
    1/2X^(2)减-x+5>0
    x-7/1x=12
    80=20(1-e)^(-t/12)
    15i*(((1+0.75i)^20-1)/0.75i)+12i*(((1+0.75i)^9-1)/0.75i) = 64
    (2x+1)(x-3)<0
    （0.44-0.0167x）sin（200.404/（15-0.3x））-0.1174x=-1.00528
    15i(((1+0.75i)^20-1)/0.75i)+12i(((1+0.75)^9-1)/0.75i) = 64
    4-x^(2)<0
    5x^3-5x=0
    1/(x-10)=1/(10+x)+1/15
    -x^(2)-2x+3≥0
    X^(2)-4x+3
    x2+4.8x=707

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