m<1/2m+4
    49×k^2+56×k-4>0
    10-4(x-3)≤2(x-1)
    2x-5>3x+4
    (x-9)/2+1≥(x+1)/3-1
    x（x－3）≤10
    2x+1<8
    13.11-0.2x<=20
    0.21+0.1x<=20
    0.21+0.1x>=0
    13.11-0.2x>=0
    13.11-0.2x>=20
    2x-6>0
    6-12x<0
    2(6-x)>3(x-1) (x/3) - 0.5(x-2) ≤1
    2(6-x)>3(x-1) x/3 - (x-2)2 ≤1
    2(6-x)>3(x-1)
    5x+5＞4x-2
    x+6≥3x+4
    2x-1≥3（x-1）

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