3x²+14x+8 <0
    7551+240n÷6＞12000
    350a+220（30-a）≤10000 100a+40（30-a）≥2660
    100a+150（10-a）≤1200 60a+100（10-a）≥680
    7551+400n＞12000
    x+3≤5
    -5小于Xsqrt（3）小于5
    60a+100（200-a）小于等于15000
    60a+100（200-a）小于等于125
    -x²+4x-4＜0
    32+32n＞400
    38+43n＞183+33n
    4/a＞-1/2
    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

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