Blogtrottr Changes are afoot at Blogtrottr! By popular request, we're bringing in paid plans with some cool new features (and more on the way). You can read all about it in our blog post. Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 線性代數XY角度 向量距離 Jun 28th 2013, 17:38 [unable to retrieve full-text content](1) x=(4 4 -4 4); y=(4 2 2 1) x.y=4*4+4*2-4*2+4*1=20 =√[(16+16+16+16)(16+4+4+1)]*cosQ =√(64*25)*cosQ =40cosQ cosQ=20/40=1/2 Q=60(deg).......ans (2) L^2=(4-4)^2+(4-2)^2+(-4-2)^2+(4-1)^2=49 L=7............ans... You are receiving this email because you subscribed to this feed at blogtrottr.com. If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions...
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