0.9x-234＜0.6(x-234）
    x²－4x＋4＜0
    -2
    x/（x^2+5）≥17/77
    x/（x^2+5）≥0.286571342856970856
    (2x+5)÷(x+1)≤1
    2x+5/x+1≤1
    x²+6x<0
    （-x＋2）（2x－1）＞0
    e^x-0.2/x^2>0
    e^x-2/x^2>0
    e^x+2/x^2>0
    e^x+(1/x^3)>0
    x^3-3x^2-9x-5>0
    -40+x-20*12%/4-x*12%/4 ≥30
    X-1564150-0.025X≥300000
    X-1564150-0.1X/4≥300000
    X-1564150-X*0.1/4≥300000
    -1564150+X-X*10%/4≥300000
    -4114150+3000000-450000+X-X*10%/4≥300000

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