15.155=28.45/（1+（x/77.84）^9.14）
    33.3101=50.06/（1+（x/85.09）^4.36）
    X/126+(21.5-X)/111-.0585=0.119
    X/126+(21-X)/111-.059=0.119
    65.4305=91.64/（1+（x/84.96）^1.78）
    X/126+(22-X)/111-.058=0.119
    X/126+(20-X)/111-.06=0.119
    X/126-(80-X)/1000=0.119
    39.7565=61.10/（1+（x/77.80）^3.35）
    x+5x+25x+250x+2500x=5600
    0.0055X+(80-X)/111=0.119
    65.4305=91.64/(1+(x/84.96)^1.78)
    65.4305=91.64/(1+(x/84.96)1.78)
    0.0000088577x*x-0.21360544x+2.56=0
    x*1.52=3.68
    exp（x）=x+5
    x^2+x=1
    3x=2(x+20)
    x*x-3x-2=0
    x*x-3x+2=0

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