4>(2+2+1.5)/(1+X%)
    4>(1.5+2+3*0.8)/(1+X%)
    4>(1.5+2+1.5+3*0.8*0.7)/(1+X%)
    4>(1.5+1.5+3*0.8*0.7)/(1+X%)
    4>(2+2+1.5+3*0.8*0.7)/(1+X%)
    4>(2+2+3*0.8)/(1+X%)
    4>(1.5+2+3*0.8)/(1+X%)
    4>(1.5+2+3*0.8*0.7)/(1+X%)
    4>(1.5+1.5+3*0.8*0.7)/(1+X%)
    4>(2+3*0.8)/(1+X%)
    4>(1.5+3*0.8)/(1+X%)
    4>(1.5+3*0.8*0.7)/(1+X%)
    4<(1.5+3*0.8*0.7)/(1+X%)
    x/400 +4/5(380-x)≤0.85
    (1.7×25+5.5×55+(X-1.7-5.5)×65)×3.1415×1+1500×3.1415×0.25≥2×（136.93+6.4×X）
    5x-5小于2(2+x)
    2/3x+1/2大于或等于1/2x
    150a+100（12-a)≥1500
    5000a+3000(12-a)<54000
    5000a+3000（12-a)<5400

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