tanx-tan（x-1）＞1
    tanx-tan（x-1）＞1
    -0.75x+1.5≥-6÷x
    tanx-tan（x-1）＞1
    2x-8≥x²
    5x-1＜3(x+1) (2x-1)/3-(5x+1)/2≤1
    ln（3x＋4）≥0
    (67.06+5*x)/(14+x)≥ 5
    （10000-2400-2500-4000）/x+10000/（x+22.4）+10000/x+10000/x＜150
    （10000-2400-2500-4000）/x+10000/（x+20）+10000/x＜1500
    (4/3)^n＞40
    (4/3)^x＞14
    15m+20(200-m)≥3400 15m+20(200-m)≤3500
    2x+1>3 x+1<6
    2x>3
    x>-5
    x²+x+5<0
    （x-3）（x+2）≥0
    sqrt（x^2+2）≥0
    10a+5(10-a)≤764

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