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
    (1/2)^x<2
    (1/2)^x>1/2x-3/4
    X-550-1000x6%/12-1500x8%/12-X*6%/12≥50
    2x^2-5x-42≥0
    0<180-2x<180
    2x+4≥0
    -12500+x-（50000+x）*1% ≥5000

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