1.05/(2+1.05)=
    (36000+36000+45562.5+45562.5)/(2×77143)=
    (tanarccos0.60-tanarccos0.95)×275.11
    (tanarccos0.60-tanarccos0.95)×268.45
    tanarccos0.60-tanarccos0.95
    tanarccos0.77-tanarccos0.93
    420×tanarccos0.77-tanarccos0.93
    275.11×tanarccos0.60-tanarccos0.95
    √2/√5
    10×4/1
    271234.788/17.64
    0.293×12×77143
    0.83/(2+0.83)=
    (34615+34615+29630+29630)/(2×77143)=
    170331.744/17.64=
    0.184×12×77143
    0.45/(2+0.45)=
    (34615+34615)/(2×77143)=
    33.9＾6-282636.3872×33.9＾4+739898611.1×33.9＾2-478853785000
    20lg110

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