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)
    2/3-11/3a小于等于1
    15大于3-2a
    14小于等于3-2a
    85大于等于5y-3(20-y)
    75小于等于5y-3(20-y)
    75小于等于5y-3(20-y)
    20-10k-k²/(10-k)>0
    4<=abs(-9/4m+9)<6
    4<=abs(-4/9m+9)<6

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