（650＋X）/（406.25＋X）＝1.4
    0.9Q*Q-2Q+15=60
    15x^2-3600x-60000=0
    a+a^2=0.75
    a+a^2=0.75
    3Q2-4Q+16=48
    4X^2+48X+155=0
    35+8L-L2=0
    35+8L-L2=0
    35+16L-3L2=0
    35+8L-L2=35+16L-3L2
    x²-120x-5300=0
    x²-120x-15300=0
    5.4289*（28+1241.9/（3.1415926*x）） = (（700-40000/(3.1415926*x))^2
    5.4289*（28+1241.9/（3.1415926*x））=（700-40000/(（3，1415926*x）^2))
    5.4289=x
    x^3-100x-24000=0
    100—（x+2）➗4=90
    （x+135）/x=251.2/182.12
    x=-lnx

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