3/3x+8≥2/5x-1
    2（5-x）＜7-x
    2x^2-4x+2＞0
    2^n>n^50
    2^n>1
    20.5+79x<19.95+86x
    25+88.5x <26+86x
    6h<-60
    -8>5+v/3
    -4b>-20
    -4b>20
    4b>-20
    4b>20
    23+102.5x <23.23+84.65x
    22+103.5x<22.29+87x
    8.4r+48<6.2r+84
    3x-5<16
    inx+1大于1
    (x+1)/3<=2x-(x-1)/2
    3(x-2)+8>6

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