(6-4y)+(3000-4y)/6*(10-6)≥1080
    -1<2a-1<1-a<1
    −2<−0.25y−2≤1
    8r>72
    6w>4.2
    x-1/1+x<0
    7-x/x<-1
    abs(1-3x)
    abs(x+1)>abs(x-1)
    86+51＞7＜a
    x-1≤(3/4)x-1/8
    2x≤3x+3
    2a^2+4a<3a+3
    a-1<2a^2+4a
    3x^2+x+1>0
    x^2+2x-2<0
    x^1/3
    2－x≥-1
    14+（n-1）2＞1.2/0.83n
    14+（n-1）2＞1.2n

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