3.333<(i+1)^7-1/i*(1+i)^7<4.167
    200x（x+15）≥0
    4x+6＜5
    3x-7＞5
    3x-7＞5
    (y/1700)-(y/5100)<0.1
    (x/340)-(x/5100)<0.1
    74x^2-273.096x-39.641>0
    x（1+x＾2）＾1/2-x＾2>-1
    ex（cosx-sinx）＞1
    xe（cosx-sinx）＞1
    ex（cosx-sinx）＞1
    2^a-a<√2-0.5
    2^a-a<1
    x*x+9x-400≤0
    e^a-a<1
    e^a-a≥1
    a^2+e^a+2^a+a≥-125
    cosx（x+1）＞1
    tanx＞x

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