50x＝91×50－5×50－300
    50x＝91×50+5×50+300
    50x＝80×50+5×50+300
    50x＝80×50+5×80+300
    200＝100×8-20×8-5×8-x
    (1-x^10)/（1-x）＝20
    (1-x^10)/（1-x）＝55
    (1-x^10)/（1-x）＝55
    （72956-2.5X）*9.6/20.6*0.9=18399+8X
    x^2+ x - 3 = 0
    0*(2.2904739580692501e-09+cos(t)*0.0089999988223880886+sin(t)*-0.01346996737921119)+0*(0.0010000007629404305+cos(t)*0+sin(t)*0)+1*(0.01619997204740321+cos(t)*-0.01346996737921119+sin(t)*-0.0089999988223880886)+0=0
    X（X-1）=8010
    200＝100×8-5×8－20×8-x
    50x－80×50-5×50－300＝0
    200＝100×8－5×8-20×8－x
    300x－120x－40x－2800000＝1000000
    2x^2-3x+5/4=0
    ㏑x=(1/x)+1
    60=0.2x
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.3175)

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