100x/28<2x+16
    x^2<5x+12<100x/28<2x+16
    x㏑x-(2x-5/2)e^(1-x)＞0
    （2x+2）e^x-4＞0
    5x + x^2 > 100
    5x + x² > 100
    x>0
    abs（x）≤3
    a^（e/a）≥e
    a^（e/a）≤e
    4-4（2m-1）≥0
    -2＜1/x＜2
    x>x+1
    2x
    2x
    2x
    4x<-100x
    4x<2x-100
    4x<2x+100
    4x<2x

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