750-750÷1+x-30x
    28125x-x*x/2=1
    s×s=－182.80
    x/（（0.01-x）（0.78-4x）=5.66×10^29
    (268.7-6k)(769+196.15k)-32.69*768.91k=0
    (268.95-6.12K)×(200K＋770)－(32.7×770K)=0
    (268.95-6.12K)×(200K＋770)－32.7×770K=0
    107.47x*x-18417.11
    -1224(K×K)＋23898.6K＋207091.5＝0
    (714.3+185.7k)*(256.56-5.78k)=32.143*714.95k
    (268.7-6k)*(769+196.15k)-32.69*768.91k=0
    (714.3+185.7k)*(257.5-5.78k)=32.143*714.95k
    x^2+3x-6=0
    1/(d＋3.85)＝1/d＋1/(d＋5)＋1/(d＋20)＋1/(d＋7.70)
    x^2+1=0
    1/(d＋9.62)＝1/d＋1/(d＋5)＋1/(d＋20)＋1/(d＋7.70)
    1/d+1/(d+5)+1/(d+7.14)+1/(d+20)=1/(d+3.85)
    (d+3.85)*(d+5)*(d+7.143)*(d+20)+d*(d+3.85)*(d+7.143)*(d+20)+d*(d+5)*(d+3.85)*(d+7.143)=d*(d+5)*(d+7.143)*(d+20)
    (d+3.85)*(d+5)*(d+7.14)*(d+20)+d*(d+3.85)*(d+7.14)*(d+20)+d*(d+5)*(d+3.85)*(d+7.14)=d*(d+5)*(d+7.14)*(d+20)
    1/d+1/(d+5)+1/(d+20)+1/(d+7.69)=1/(d+3.92)

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