3/2x－1 －6/9x+2≤1
    x+1>2 2x+3≥1/2x
    2x+3≥1/2x
    x+1>2
    13.275^3×(1.55+3.2x)^2＝(1.55x+1.25x^2)^5
    -5x+90-arctan1.25>0
    5(x-2)+8<6（x-1）+7
    x^2+7x-35>0
    (（2x-1）/3)-1>x-(5-3x)/2
    3x-8≤-x
    (x-387)÷x=400÷1000
    (x-387)/x=400/1000
    (x-387):x=400:1000
    x-3<0
    x-3（x-2）≥4
    x+1>0 3x-8≤-x
    x*255>x*0+(1-0)
    x^2+x-6<0
    x<=x+(1-1)
    x

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