1-2-3x/5>1+x/2
    x+x＜2x
    x（x-80）＾2（x-81）＾2（100x-x＾2-1）≥0
    （x＾3＋2x＾2+x）/4≥0
    （9x＾2-2x＾3-x）/6≥0
    x＾3＞x+1
    x-1/3≤1
    7-2*(x+2)＜5
    （4*x-33)/3-2*(x-4)＜-1
    5x＋15（1200－x）≤[25x+45×（1200-x)]×0.3
    (x+1)(2*x-3)＞0
    0.5*（x+3）≤6
    0.5（x-3）≤6
    5x+10(80-x)≥720
    15x+35(80-x)≤2500
    4m^2－8m＞0
    (2x-3)/2>=(x+2)/3
    3x-5<4 -3x+5<4
    -x-1>=-1-x
    0.5x+1<3

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