-x^2＜0
    -x^2+4x-4＞0
    -x^2+4x-5＜0
    -4x^2-12x+9＞0
    -3x^2-5x+2＞0
    -2x^2+x+1＜0
    -x^2-2x+3＞0
    -x^2-3x+3＞0
    -2x^2+x+1＜0
    x(6x+5)<4
    10000/(x+0)+10000/(x+4.8)<=150
    10000/(x+4.8)+10000/(x+14.4)<=150
    10000/(x+4.8)+10000/(x+14.4)<=150
    10000/x+10000/(x+9.6)<=150
    2x-1<3
    （15+x）（18-0.2x）＞15*18
    10000/x+10000/(x+16+52)+10000/(x+24+52)*2<=250
    10000/x+10000/(x+16+52)+10000/(x+24+52)*4<=350
    10000/x+10000/(x+16+52)+10000/(x+24+52)*6<=450
    10000/x+10000/(x+16+52)+10000/(x+24+52)*7<=450

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