16.254×n×n+5.526×n×n×n-2035.24-396.734×n≥0
    16.254n2+5.526n3-2035.24-396.734n≥0
    5/（X+3）≥1
    0.4^n≤0.01
    0.4*n≤0.01
    2x-4<4-3+x
    x1+x2+x3+x4<=11000 x1/(x1+x2+x3+x4)<=0.65
    11<15x<13
    11<15x<12
    15<16x<17
    9<8x<11
    7<5x<9
    4<5x <6
     11<10x <13
    12< 13x <14
    6< 6x <8
     9< 6x < 11
    14< 18x < 16
    3< 4x < 5
    5< 4x < 7

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