3x+2(x-2) 3x-4<=11-2x
    1－2X≥X+7/2
    3x+2(x-2);3x-4<=11-2x
    -x+3≥0
    XX+9>5
    1/3x ^2+1/5x-1/7>0
    x ^2+x-1>0
    ( 40 % + 15 ) ÷ ( 60 % - 15 ) = 3 ÷ 4
    x+3>4x
    3x-7<8
    (1200-x^2)/4x>0
    (1200-x^2)/4x
    0>58n-4n^2
    0<58n-4n^2
    -2x^(2)+x>8
    （2x^2-3x+1）/（3x^2-7x+2）>0
    y×0.72=1
    (720-12x/5)+2x=130
    720-12x/5+2x=130
    600≥X-(X/300*40-140)-0.05X X≥900

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