（x-2)*(x+3)^2(x-4)^3<0
    (x-1)^2*(x+3)*(x-5) < 0
    6y+21>=4y+26
    2/1-3>5x+4/1
    [(15.8+2t)*(127.48+8.2t)/(15.1+t)]/95>=1.8
    [(16.4+2t)*(135.69+7.8t)/(15.4+t)]/95>=1.8
    [(15.8+2t)*(133.82+8.4t)/(15.1+t)]/95>=1.8
    [(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

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