6-11/8
    0.0405×7.145×3.6^2+0.0965×1.875×3.6^2=
    0.0093×6.77×3.6^2+0.0210×1.5×3.6^2=
    0.0399×6.77×3.6^2+0.0892×1.5×3.6^2=
    0.0399×6.77×3.6^2+0.0892×1.5×3.9^2=
    12/5.8
    120+46+17+8
    arctan(1.5*sqrt(3)/(18.5))
    -29/6*1/5
    arctan(1.5*sqrt(3)/(8.5))
    -6/29*1/5
    arctan(1.5*sqrt(3)/(2.5))
    arctan(1.5*sqrt(3)/(-1.5))
    －√3/3（－√7+√3+1）（－√7+√3+1）－2√3/3（√3－√7+1）+3
    0.0089×4.51×3^2+0.0174×1.875×3^2=
    39*18
    0.0409×4.51×3^2+0.0965×1.875×3^2=
    0.0965×4.51×3^2+0.0174×1.875×3^2=
    0.0409×4.51×3^2+0.0089×1.875×3^2=
    8.96*18

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