1687300-4100-45000-X≥300000
    -x^2+36x-5120≤0
    -x^2+40x-300≤0
    -x^2+40x-300<0
    3（k^2+2k）-(2k+1)^2>=0
    3>2
    e^x-1-tanx＞0
    1.6x+0.4(20-x)<=17.6
    30x+24(35-x<=1000
    10x-5（20-x）≥90
    10（20-x）-5x≥90
    -4+a+5>=-1
    16m²+8-32m-12(16m²+1-8m)≤0
    0.5X-3>-14-2.5X
    6/1*X-1-1<2/1X
    4*(X-1)<2X-6
    5X-2>3
    x^3-2x^2-3x-3>0
    x+1/x>4.25
    4x x>8

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