163020/475-163020/（475+x）<(101-x)/2
    163020/475-163020/（475+x）<101-x
    163020/475-163020/（475+x）<25
    163020/475-163020/（475+x）<50
    163020/475-163020/（475+x）<1
    163020/475-163020/（475+x）<5
    163020/475-163020/（475+x）<10
    163020/x-163020/（x+10）<3
    779999/x-77999/(x+10)<5
    50≤31.3+C-C×6%/4≤60
    31.3+c-c×6%/4≤60
    24x-6*sqrt(36-12x)-36<0
    6*sqrt(36-12x)+48x-108>0
    12x-12*sqrt(36-12x)-108+18*sqrt(36-12x)+36x>0
    10x-1>7x
    0.06*42000>0.48y
    15+3（x-5）×80％≤27
    15-3（x-5）×80％≤27
    49x^4-1376x^2+256≤0
    x^2-8x+8>0

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