(1-x)^5*1/5+[1-(1-x)^5]*(1+1/5)<1
    -2x+1>0
    3-2x>=9+4x
    (15180-13x)×1000/(5000000-(15180-13x)/1.518) ＜0.02
    x
    a>-5/4 a-4>0
    16x+4(600-x)<7000
    52x+28(30-x)<960
    2x+3<0
    x1+x4+x5+x6+x7>=300 x1+x2+x5+x6+x7>=300 x1+x2+x3+x6+x7>=350 x1+x2+x3+x4+x7>=400 x1+x2+x3+x4+x5>=480 x2+x3+x4+x5+x6>=600 x3+x4+x5+x6+x7>=550
    x^2-6x+1<0
    4－x^2≥0
    （x-3）（4-x）＜0
    x＾2＞1
    7x+3<20
    3x-18<-8x-10
    （1-x/50）^4*(1+x/10)>3
    （1-x/50）^4*(1+x/10)>1
    (3+3m)m＞0
    (2-m)m＜0

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