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    1561.00×[1-1/(1+8.0%)^39.89]
    1561.00×[1-1/(1+8.0%)39.89]
    186.264+136.24+20=
    142.6+136.24+20=
    0.7×9.8×(26.74-6.88)=
    0.65×286.561=
    (0.575×2.31+0.45×3.47+0.7×17.37+0.65×3.59)/26.74=
    286.561×(tan(45-16.13/2)*tan(45-16.13/2))-2×12.87×tan(45-16.13/2)=
    286.561×(tan(45+16.13/2)*tan(45+16.13/2))+2×12.87×tan(45+16.13/2)=
    (8×2.31+7×3.47+14×17.37+16.2×3.59)/26.74=
    (22×2.31+30.8×3.47+12.9×17.37+13.8×3.59)/26.74=
    17.8×2.31+19.2×3.47+17.8×(6.88-3.47-2.31)+(17.8-9.8)×(17.37-6.88+3.47+2.31)+(17.9-9.8)×3.59=
    205.67+139.738+20=
    160.583+139.738+20=
    =0.7×9.8×(28.7-8.33)=
    0.655×314=
    (0.575×5.24+0.45×1.67+0.7×17.49+0.65×4.3)/28.7=
    314×(tan(45+15.738/2)*tan(45+15.738/2))+2×12.827×tan(45+15.738/2)=
    314×(tan(45-15.738/2)*tan(45-15.738/2))-2×12.827×tan(45-15.738/2)=
    (8×5.24+7×1.67+14×17.49+16.2×4.3)/28.7=

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