4<-2/m<-5m
    -8/37x-26/37<-8x+50
    -8/37x-26/37<-2/13x+38/13
    -8/37x-26/37<-2/3x+76/15
    -8/37x-26/37<2/5x+104/5
    -2/13x+38/13>-12
    -2/3x+76/15>-12
    2/5x+104/5>-12
    -8x+50>-12
    sqrt((0.001/sqrt3/0.8)^2+4*(0.404/1.795/n)^2)≤0.01
    sqrt((0.001/sqrt3/0.8)^2+4*(0.404/1.795/n)^2)≤0.01*9.8
    9.8*sqrt((0.001/sqrt3/0.8)^2+4*(0.404/1.795/n)^2)≤0.01
    1.16∧x－0.3*x＜=0
    （2k+3）^2-4k（k+1）>0
    （2k+3）^2>0
    -2x²+72x+320≧870
    5x^2-6x-2≥0
    x²-14x+45≤0
    x^2＞16
    x^2＞9

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