x^2+2x>4-x
    2-x>2x+1
    x-2>0 2x+1>0 x-2>2x+1
    x-2>2x+1
    2-x<2x+1
    x-2<0 2x+1<0 x-2<2x+1
    k(k+4)>0
    100-x<=2x
    35x+15(50-x)>=1530+1150
    223>3850*x-(52.5/(35x+0.42))
    223>3850*x-(105/(35x+0.42))
    34n－3n＾2≥0
    3000≥20x＋30（x－5）
    223>385*x-(52.5/(3.5x+0.42))
    223>385*x-(10.5/(3.5x+0.42))
    0.16×1.04^（n-1）＞（0.05×n+1.05）×0.18
    0.16×1.04^（n-1）＞（0.05n+1.05）×0.18
    0.0075x^2-2.25x+50<0
    (500-x)*(1+0.005x)*1.5>750
    (7-x)(3-x)(4-x*x)<=100

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