x^(x-31)-(x-31)^x=31
    0.6x+90+60=1.4×(0.4x+90+60)
    xcosx＞-1/3 x＞-2 x＜0
    xcosxcosx＞-1/3
    xcosx＜-1/3
    1.5x-x=5
    12+x＞23
    50x^2+4.7x-2000>0
    1+e^2
    3.5x-1x＜21
    41.6（x^3/2-x^2/3）<25000
    x+5＞3+6x
    （x-6）＋（x－4）＝x-1
    2x-1/5≤x+7/3
    4x/7-3≥-11
    lnx=5
    1/(2880*256*n^4)<=0.5*10^-7
    15*x^2-750*x+8060<=0
    125 * x ^ 2 - 2200 * x + 8060 <= 0
    15*x^2-2200*x+8060<=0

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