1-e(-(5000-k)*0.85^k*(1-0.85)-0.85^k)>0.99
    8/x＜4x
    x^2＜-8/x
    x^3＜-8
    8＜-x^3
    8/x＜-x^2
    x-1/2x-3≤1
    60x+40(2x+4)>2400
    5x-(20-2-x)2>=60
    -1/（3+m）<0
    (7-m)^2-4(3+m)>0
    2（x+2）－3x＜1
    -1<=1-x^2<=1
    3(2/5x+2)>=6-2(1-x)
    2(x+1)-3(1-x)<6
    -3（x+1）-（x-3）<8
    2x-3<1/2(x+2)
    80976/6.7*（1+0.0797)^n＞61453*（1+0.0159)^n
    600-60y+100y>=680
    1000-100y+150y<=1200

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