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=
    （22×5.24+30.8×1.67+12.9×17.49+13.8×4.3）/28.7=
    17.8×5.24+19.2×1.67+17.8×（8.33-1.67-5.24）+（17.8-9.8）×（17.49-8.33+1.67+5.24）+（17.9-9.8）×4.3=
    157.45+142.55+20=

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