1/(d+5)=1/(d+2)+1/(d+3)+1/d
    2s^3+5s^2+4s+0.75＝0
    3k^2+2k+3=0
    k^2=1
    63k^2+2k+63=0
    x*5+6=10
    5x^2+16x+8=0
    - 0.5(x-2)^2+2 = -1
    0.5(x-2)^2+2=-1
    9990x-30000=12000
    t^2+16^2=(16-2t)^2+64+4t^2+(8-t)^2
    X+(X*10%)=100
    （36-x）（24-x）=805
    190/[190+250×(1-x)]
    0.1277/x＝0.1289/0.86289
    0.1289/0.86289＝0.1277/x
    0.4/100.58＝x/32.1
    （25.851+x）×2.05＝51.702+70.453-x
    0.128/x＝0.1289/0.86289
    0.4/100.58＝X/32.2

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