10000/x+10000/(x+4.8)+10000/(x+9.6)*5<=350
    10000/x+10000/(x+4.8)+10000/(x+9.6)*6<=350
    10000/x+10000/(x+4.8)+10000/(x+9.6)*6<=350
    10000/x+10000/(x+4.8)+10000/(x+9.6)*6<=350
    10000/x+10000/(x+4.8)+10000/(x+9.6)*5<=350
    10000/x+10000/(x+4.8)+10000/(x+9.6)*4<=350
    10000/x+10000/(x+4.8)+10000/(x+9.6)*3<=350
    10000/x+10000/(x+4.8)+10000/(x+9.6)*2<=350
    10000/x+10000/(x+4.8)+10000/(x+9.6)*3<=250
    10000/x+10000/(x+4.8)+10000/(x+9.6)*2<=250
    10000/x+10000/(x+4.8)+10000/(x+9.6)<=250
    10000/x+10000/(x+4.8)+10000/(x+9.6)<=150
    10000/x+10000/(x+4.8)<=150
    sqrt（x^2-1）＜1
    sqrt（x2-1）＜1
    sqrtx2-1＜1
    1/x+2≤3
    2cos(1/2a)<1
    0.23X^2+3X-12.54≥0
    abs(x-2)-abs(4-2x)<=-1

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