Mathematics
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    108y+156(400-y)≤48000 61y+51(400-y)≤24000
    60X≥48000 40(210-X)≥24000
    (2x+1)÷5<(x+1)÷2
    x-3(x-2)≥4
    x²/1-e^x<0
    x²/1-e^x<0
    x²/1-e^x>0
    x^2/1-e^x>0
    x^2-e^x>0
    x/1-e^x<0
    x/1-e^x>0
    x/1-e^x<0
    3x^3+3x+5≤5x^2+2x+9
    (m+2)^2-2m(m+2)+4<0 (m-1)^2-2m(m-1)+4>0
    (m+2)^2-2m(m+2)+4>0 (m-1)^2-2m(m-1)+4<0
    2500≥36x+20(100-x)
    0.7×40x<0.8×40(x-6)
    34≥1.2(10+x)+x
    1800≥80(20-x)+110x
    2000≥20x+42×30

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