√（x+1）/ln(2-x)小于等于0
    √（x+1）/ln(2-x)≤0
    √x+1/ln(2-x)≤0
    ln(2-x)≤0
    ln(2-x)＜0
    6X^2+X-2<=0
    2X^2-3X-5>0
    2X^2-3X-5<0
    (-M)^2-16>0
    X^2-4X+3>= 0
    X^2-4X+1>= 0
    X^2-4X+1 >= 0
    X^2-4X+1>=0
    -2X^2+X>3
    2X^2+3X+10>=0
    X^2+2X+1<=0
    7X^2+2X-5<=0
    2X^2+3X>=0
    X^2+3X-4<=0
    -x^2+4x+5<=0

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