10＾12+16*10＾6*r*r ≤0.01*(100000+16*r*r)＾2
    10＾12+16*10＾6*r*r≤0.81*(100000+16*r*r)＾2
    1/2（c+3）≤1
    x-3≥0
    x-3≤3x+1
    （4x-5）/11＜1
    25/16+12+4b＞0
    0.81x*x*x*x+62x*x≤1900
    0.81x*x+62x≤1900
    (x+11)/3>(x-2)/2
    (x+11/3>(x-2)/2
    5-2x<=-1
    -2x<=-6
    -4>=-9x
    4x-4>-5x
    x>=(40-x)*5/6
    2320x+1900(40-x)<=85000
    x^2-1/x^2＜0
    (3-2x)/2＜x
    5-2(x-3)≤3

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