15sinx+8cosx大于等于
    0＜lnx+1<1
    m²+54m+225＞0
    0≤arcsin(2x－1)≤2/π
    arcsin(2x－1)≤2/π
    (x-1)^2-4*(x-1)*(1-3x)>=0
    ((x-1)*(x-2))/((x+1)*(x+2))>1
    (x+5)/(x-3)>1
    (x+3)/(x+2)<2
    (4x^2-x-3)/(2x^2-x-3)<=1
    (y-1)^2-4(y-1)(1-3y)>=0
    （1-y）^2-4(2y-4)(3-3y)>=0
    2x>-2
    6/x＜2
    0.3^n≤0.1
    6x²-7x + 2≤7x²-11x-3
    5x-x² - 6 < 0
    25-x²≤0
    -3x² + x + 4≥0
    x²+2x + 3≥0

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