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
    X^(2)-4x+3≥0
    （0.9*0.0001-X)*(4.1*0.0001-2*X)^2=(3.4*0.0001-X)*(1.6*0.0001-2X)^2
    5t^2+t-500<=0
    1/x+1/x+2+1/x+4=0
    5t^2+t-500=0
    t+5t-500=0
    -(1-x)*(1-x)*lnX=2.7
    5+3

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