5/3m-1>0
    3-m>0
    15x+30x≤6300
    0.9m+0.95*(200-m)≥0.93*200
    0.9m+0.8*(200-m)≥0.93*200
    3x－15≤x-8
    4x＋4≤7x＋10
    x^2*x-2≤0
    2-x小于等于-1
    1+2x大于3+x
    （x-2）^3*（2x-x+1） *（x-1）*（x+1）^2 ≤0
    （2x-4）（x+1）<0
    (8-(x-15）x0.2)>40
    (8-x-15/1x0.2)>40
    26700+W*（1-10%/4）≥50000
    88.6-x/x-58.6=1.2/8.8
    [2(m+1)]^2-4(m^2-1)
    [2(m+1
    1/2≤k^2≤1
    50*1.08*a+0.9*(50-a)*80≤3260

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