（H*0.6*26+（H*2+0.6）*0.5）*1.2+0.6*3*1.4≥15
    （H*0.5*26+（H*2+0.5）*0.5）*1.2+0.5*3*1.4≥15
    a≤-a/2
    26700+x-x*2.5%≥50000
    26700+x-x*2.5%≥50000
    26700+X-X*2.5%>50000
    5X<>=
    2大于(3x+8-5(x-1))
    0小于等于(3x+8-5(x-1))
    0小于等于5-(3x+8-5(x-1))
    n^8>2^n
    200a+(30-a)170<=5400
    450a+(30-a)380<=5400
    4x-(25-x)>=85
    0.5(2m-1)>0.5(1+m)
    a<1 a<0
    2x<=2
    (2+4x/(x+6))x≤(7-4x/(x＋6))×6
    210大于等于16m+12(15-m)
    198小于等于16m+12(15-m)

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