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三解題(共70分解應(yīng)出字明證過(guò)或演步)17ACabcosA+2bC124

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16{}a2nN*nN*[)annN*2

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n21n1n21n1nn3221nnnaaa+a+aa+a++

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0三解題(共70分解應(yīng)出字明證過(guò)或演步)17ACabcosA+2bC124

D1ccos++2bcos0CcosA+sinB0ACBC180C2ab

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1122ABCC191bx+

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2Ml

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抽案該獲得金數(shù)為Z

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2a1fx2a0fx1xea0'x

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x1x請(qǐng)生第22、23兩題任一作注:只做選的目如果做則所的第個(gè)目分[選：坐系參方選講]22xOylρcos

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