2023-2024(±)

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11.150

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15.67°

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67°.

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19.20036°

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200;

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36°;

on

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20.r^lW:???2a-i[iWA￥A?^3,h-iaWAW±4,

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A/DBC=/ADB=26°.

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(2)èW^a<]tè^,aJ'^CDA=180°-128°=52°,=zBDC=

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22.[^1W-:(l)Wnnn)?m#aWWW!èX7G,ifnBWWOW?,

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M={y=90’

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(2)50x80+70x90-50x80x0.8-70x80x0.7=3180(Tü).

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