9< 12x < 11
     14< 15x < 16
    10 < 9x <12
    4< 3x < 6
    (m+1)^2-4(m-1)(-m)<0
     16< 21x < 18
     15< 16x < 17
     9< 8x < 11
    (m+1)^2-4(m-1)(-m)>0
     5< 4x <7
     0.95*(17.26+93.51x) <0.95*(28.34+62.6x)
     17<14x < 19
    0.95*(17.26+93.51x)<23+65x
     17< 11x <19
     12<6x < 14
    -（n+n）^2/2+36<0
    -（n+n）2/2+36<0
    -n+n2/2+36<0
     8<8x < 10
    23 < 22x < 25

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