[(17.4+2t)*(153.02+9.1t)/(15.9+t)]/95>=1.8
    [(17.4+2t)*(153.02+t)/(15.9+t)]/95>=1.8
    [(15.8+2t)*(133.82+t)/(15.1+t)]/95>=1.8
    （2x-1）/3-(5x+1）/2≥1
    5-2x>=2x-1 x+3>2x
    p＋2p(1－p)＋3(1－p)∧3＋3p(1－p)∧2＞1.75
    18<7+2.4(x-3)<=19
    492-42（6-5a）-6.4（30+50a）≥15
    5x＋3＞23
    3-2x>-1
    -3<2÷(3x-1)<2
    6((2÷3)x+1)>2x-5
    7(x-1)<4x+3
    (x-7)/15<(x-2)/5
    （1/2）x-1≤3-(3/2)x
    x>-2
    3(x-2)-1>2(x-4）
    2x+1<3
    5x-4>2+7x
    3x<4

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