1800/(1+x)^2+7500/(1+x)-8000<0
    1800/(1+x)^2+300/(1+x)-8000<0
    2x＜3
    x^2-0.5x-1.5<0
    3+abs(2*y-1)>1
    2x+3x大于等于0
    e^2+e/2-1/2<0
    2e^2+e-1<0
    30
    x+1>12
    （x+1）(2x-1)>0
    2/x＜1 x^2-x-2＜0
    1-X＞=0＜=1
    4x＾2-x-1＜0
    -4x＾2+x+1＞0
    16a²－48a＋33≤0
    3*x-x^2>0
    2*x^2+(9)*x+7<0
    2*x^2+(7)*x<0
    e{(lnx/sqrtx)+(lnx/(x^(1/8)))}-1>1-e{lnx/sqrtx-lnx/(x^(1/8))}

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