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))}
    1/2*x^2+1/2*x >= 1
    e^{((lnx)/x^(1/2))+((lnx)/(x^(1/8)))}*e^((lnx/(x^(1/8))))+e^((lnx)/(x^(1/2)))>2e^((lnx/(x^(1/8))))
    x^2＞x^-2
    -3x^2+2>0
    (（x-10）^3) *130<(((3*x)/4) ^3) *2.5*x
    (（x-10）^3) *130>(((3*x)/4) ^3) *2.5*x
    (x+2)^-4＜16

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