( 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
    600≥X-(X/300*40-140)-0.05X
    600≥X-(X/300*40-70)-0.05X
    0≥X^2+524.625X+4500
    0≥X
    1800+（30√2-20t）^(2)≤450
    9（a+1)^2-4(a^2-1) <0
    9（a+1)^2-4(a^2-1)<0

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