Mathematics
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    18-2x²<0
    18-2x<0
    -3x²+5x+28≥0
    -4x²+4x-2<0
    4x²-4x+2>0
    -4x²+4x+2<0
    -408-45+300+X-X*10%/4大于或等于30
    -408-45+300+X-X*10%/4大于或等于30
    -408-45+300+X-X*10%/4大于或等于30
    16x²+24x+9≤0
    -x²+2x-1≤0
    x²≤4
    2x≥3x²
    -2x²+x≤-15
    x²-x-72≤0
    0<25tanx-(4.9*25)/(16*cosx*cosx)<3.44
    0<25tanx-(4.9*25)/(16*cosx^2)<3.44
    1.05×0.16×1000<2300×x
    1.05×0.57×1000<2300×x
    2.08*e^(6.5%*h)> 5.00*e^(0.5%*h)

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