－2x²+x≤－3
    510+128n>10(110-4)
    510+128n>10(110-4)
    332+32n>400
    332+32n>400
    332+32n>400
    332+32n>400
    tanx＞-3
    tanx＞-3
    tanx＞-3
    2 x+ x/60≤30
    (1/3)^x>3
    32+k+1<=2^k
    ［x-3］≤3
    1/x＞1
    3x>1
    0
    0
    0
    1/2x-3/4<2

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