0>15x^2+39x-18
    8x^2>12x-4
    2x-1÷2x+1≥0
    0<(x+3)(x-2)(x-1)<1
    0<(x+6)(x-2)(x-1)<1
    x^2≥2.33×10^－8×(.0.1－x)
    3^2x>1
    2^2x>1
    -3x^2<26x+16
    -32<3x^2-20x
    -6x+9<3x^2
    -42x-9<-15x^2
    -15x^2-40<49x
    -4x^2-29x-30<0
    39x<15x^2+24
    4x^2-4<0
    -8x^2-30<34x
    20x<25x^2-21
    -x^2-14x-49<0
    -40x<8x^2+42

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