2x∧3-3x∧2-8x＋12≥0
    0.9x>100+0.8(x-100)
    0.9x<100+0.8(x-100)
    6x/(x*x+1)＞2x-1
    2x+5＜4x-1
    2x+5＞4x-1
    2x+5＞4x-1
    x-1/x-2>1
    7(x+100)-6x>=240×7×0.6
    19.09x^3>1.25*2.17*(10+x)^2+0.9*1.25*(10+x)^3
    3m^2-14m-25>0
    m^2+m+14>0
    x＋8<7
    6-2x≥0 x-1/2-1<2x-4/3
    80n+120（20-n）≤2200
    80n+120（20-n）≤2200
    80n+120（20-n）≤2200
    x-lg(x)<0
    log(2,x)<0
    x-1<3

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