-1≤（-3x+4）/5
    205.7506x+1<(187.046x+1)^1.01
    205.7506x+1<(187.046x+1)^1.1
    -2≤1÷(x-1)≤3
    1÷(3-2x)≤1÷2
    1÷(1-2x)≤1÷2x
    1÷(2x-1)≥2
    1÷1-2x≤1÷2x
    3x^2-5x+2≥0
    2x^2-4x+10≤0
    abs(2x-1)≤-5
    abs(3x-2)≥4
    abs3x-2≥4
    2+x/2≥2x-1/3
    3（x-1)<5x-2
    x^(2)+x≤2
    x＋1<0
    (x+2)(x-3)<6
    -3x^2-11x+4>0
    1÷3-4x≤1÷2x-3

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