6x-30+2x>=75
    5x+1>3x-3
    (16k+4)(2k+1)(2k+2)-(4k+3)(16k+16)k>0
    e^(0.297+0.417x)/1+ e^(0.297+0.417x)>45/73
    e^(0.444+0.228x)/1+ e^(0.444+0.228x)>45/73
    e^(0.313+0.389x)/1+ e^(0.313+0.389x)>45/73
    e^(0.297+0.417x)/1+ e^(0.297+0.417x)>45/73
    e^(0.444+0.228x)/1+ e^(0.444+0.228x)>45/73
    e^(0.313+0.389x)/1+ e^(0.313+0.389x)>45/73
    100≤100（1+x）*0.8≤107
    20-x>=5
    (6.6-1.5)x+(8.8-1.2)(20-x)<=120
    240a+200(40－a)≦6000
    log(0.1,x)≥0.1^x
    log(3,x)≥3^x
    log(2,x)≥2^x
    （x-1）^（1/2）+（4x-1）^（1/2）＜2x
    （x-1）^（1/2）+（4x-1）^（1/2）≤2x
    （x-1）^（1/2）+（4x-1）^（1/2）≥2x
    5X-1<3X+3

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