x^3-x≤0
    x²-x+1/4＜0
    arcsin（2x-1）≥0
    (3/2)x-7<=-(1/2)x+1
    19a-5>0 a-2<0
    19a-5>0 a-2<0
    5x-10>=2(x+1) (1/2)x-1<=7-(3/2)x
    3(x+2)>4x+2 x/2>=(x-1)/3
    1/2x+1<7-3/2x (3x-2)/3>=x/3+(x-4)/4
    (4+x)/2+1>=4(x+1)/3
    6x+15>2(4x+3) (2x-1)/3>=(1/2)x-2/3
    x-1>0 3(x+2)<5x
    6x-2>3x-4 (2x+1)/3-x/2<1
    4x-2>=3(x-1) (x-5)/2+1>x+3
    5x-2>3(x+1) (1/2)x-1<=7-(3/2)x
    10x>7x+6 x-1<(x+7)/3
    (3x-2)/3>=1 4x-5<3x+2
    5x-1<3(x+1) (2x-1)/3-(5x+1)/2<=1
    x-1>-2(x-1) (1-x)/2+10>=(x+2)/3
    3x+3>=2x+7 (2x+4)/3<3-x

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