6*sin48
    3.14×0.9×（0.2×65+14.8×65）+3.14×0.45×0.45×1800=
    3.14×0.9×（0.2×65+13.8×65）+3.14×0.45×0.45×1800
    3.14×0.9×（0.2×65+17.8×65）+3.14×0.45×0.45×1800=
    3.14×0.9×（0.2×65+19.8×65）+3.14×0.45×0.45×1900=
    3.14×0.9×（0.2×65+2.2×65）+3.14×0.45×0.45×1800
    (sqrt(99)+sqrt(96)+sqrt(91)+sqrt(84)+sqrt(75)+sqrt(67)+sqrt(51)+sqrt(36)+sqrt(19))*4
    A(0,0)C(100,20)
    (0,0)(100,20)
    2*(23*14)
    0.125*0.85*(4300^2)
    0.25*0.85*(4300^2)
    1/2*3.14*10
    (4-7.372281)^2+(5-7.372281)^2
    (4-1.627719)^2+(5-1.627719)^2
    1.8157*2.71^(-1)
    1-1.8157*2.71^(-1)
    1-0.18157*2.71^(-1)
    3.302776^4+(1/(3.302776^4))
    3.302776^2+(1/(3.302776^2))

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