（100-x）×2（1+2x%）≥200
    2x-1＞0
    16(m-2)(m-2)-60<0
    (11/12)^x<=0.04
    0.06*x+0.54*x+0.3*x+0.9*x>265
    x*50*7>265
    364^x/365^x<0.05
    364^n/365^n<0.05
    364^n/365^n>0.95
    x^2+x>=1
    100*0.7^x<20
    abs((x*x-1)/(x-1)-2)< 30
    abs((x*x-1)/(x-1)-2)< 3
    abs((x*x-1)/(x-1)-2)< 5
    abs((x*x-1)/(x-1)-2)< 10
    abs(2x-6)< 2
    abs(2x-6)< 1
    abs(2x-6)<0.1
    abs(2x-6)<0.01
    abs(x)<5

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