2x+1<4-x 2x+1>x-4
    (x^2-2x-2)/(x^2+x+1）小于2
    2x+1<4-x 2x+1>x-4
    abs(x-1)<1
    x²-8x+12<0
    3/（x-2）小于等于1
    x+2>23
    tanx＞－π/9
    ( x+1)(x+6)<0
    x^3-4x-3≥0
    x^3-4x-4≤0
    16a²+40a+25>17/4
    sqrt(x^2-1)>sqrt(2x^2+4x)
    (x+2)/(x^2-5x-6)≥0
    (x-1)²(x+3)<0
    x/55乘550加495（700-x）/45小于等于7370
    0小于4x加3减6x加6
    2大于等于4x加3减6x加6
    2大于等于4x加3减6x减6
    0小于4x加3减6x减6

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