a*a+a=240
    e^x=0.95
    a*a+a=240
    70-60=10*log(10,x/5)+0.3*(x-5)
    60-70=10*log(10,x/5)+0.3*(x-5)
    2/(1+x)^2.792 + 1.2/(1+x)^1.792 + 0.8/(1+x)^0.792 + 114.5/(1+x)^3.792 - 114.100 = 0
    1.44/(1+x)^3.392 + 1.2/(1+x)^2.392 + 0.8/(1+x)^1.392 + 0.4/(1+x)^0.392 + 109.5/(1+x)^4.392 - 109.824 = 0
    1.44/(1+x)^3.392 + 1.2/(1+x)^2.392 + 0.8/(1+x)^1.392 + 0.4/(1+x)^0.392 + 108/(1+x)^4.392 - 109.824 = 0
    2（x-x）=3（x-x）
    cosx＝0.454
    cosx＝0.454
    1.44/(1+x)^1.896 + 1.2/(1+x)^0.896 + 109.5/(1+x)^2.896 - 110.000 = 0
    1.44/(1+x)^3.474 + 1.2/(1+x)^2.474 + 0.8/(1+x)^1.474 + 0.4/(1+x)^0.474 + 111.5/(1+x)^4.474 - 106.462 = 0
    1.44/(1+x)^4.559 + 1.2/(1+x)^3.559 + 0.8/(1+x)^2.559 + 0.4/(1+x)^1.559 + 0.24/(1+x)^0.559 + 111.5/(1+x)^5.559 - 118.149 = 0
    1.2/(1+x)^2.712 + 0.96/(1+x)^1.712 + 0.64/(1+x)^0.712 + 106.5/(1+x)^3.712 - 110.599 = 0
    14.3x^2+12404x+868280=2288000
    14.3x^2+8860x+443000=2288000
    101.2/(1+x)^2.101 + 0.64/(1+x)^1.101 + 0.32/(1+x)^0.101 - 100.911 = 0
    102/(1+x)^3.101 + 0.96/(1+x)^2.101 + 0.64/(1+x)^1.101 + 0.32/(1+x)^0.101 - 100.911 = 0
    14.3x^2+8860x+443000=2288000

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