(1.1*683.05)/(0.4*46.80)
    ((91.7-46)-(82.92-35))/(ln (91.7-46)/(82.92-35))
    3.66427*3.89*（82.92-35）
    0.41*2.925+（1-0.41）*4.178
    (82.92+35)/2
    1.816/(π/4 〖（0.389-0.008×2）〗^2 )
    √((4×1.816)/(π×20))
    √((4×2.2462)/(π×20))=
    2.2462/(π/4 〖（0.389-0.008×2）〗^2 )
    √((4×2.2462)/(π×20))
    2.59/(π/4 〖（0.089-0.004×2）〗^2×774.43)
    0.00223/(π/4 （0.108-0.004×2）^2 )
    √((4×2.59)/(π×0.7×774.43))
    60.327785/0.3048
    0.00223/(π/4 〖（0.108-0.004×2）〗^2 )
    √((4×0.00223)/(3.14×0.3))
    3.89/(π/4 〖（0.133-0.004×2）〗^2×774.43)
    √((4×3.89)/(π×0.5×774.43))
    38.555351/0.3048
    24.267192/0.3048

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