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yingtianping

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(A¡ÁB)∙(C¡ÁD)=(A∙C)∙(B∙D)-(A∙D)∙(B∙C)

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ÖÁ×ðľ³æ (ÖøÃûдÊÖ)

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2Â¥2013-08-27 00:31:36
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3Â¥2013-08-27 03:07:17
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yingtianping: ½ð±Ò+5, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, ÇåÎúÃ÷ÁË£¡ 2013-09-03 17:13:13
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(1) a∙(b¡Ác)=(a¡Áb)∙c
(2) a¡Áb=-b¡Áa
(3) a¡Á(b¡Ác)=(a∙c)b-(a∙b)c

(A¡ÁB)∙(C¡ÁD)=[(A¡ÁB)¡ÁC]∙D=-[C¡Á(A¡ÁB)]∙D=-[(C∙B)A-(C∙A)B]∙D=(A∙C)∙(B∙D)-(A∙D)∙(B∙C)
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4Â¥2013-08-27 12:16:48
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