求以 [tex=5.286x1.357]7W4e86lGCd+JvHw5QXkT3g==[/tex], [tex=5.214x1.357]RJwPK0jvxfaBvcyNmso34A==[/tex] 为邻边的平行四边形面积及与 [tex=0.571x0.786]c59+3vo0/Vn/FvNRhDRu5g==[/tex], [tex=0.429x1.0]JThLUuJ8WswSAPiYZWihWg==[/tex] 都垂直的单位向量.
举一反三
- 求向量[tex=0.571x0.786]c59+3vo0/Vn/FvNRhDRu5g==[/tex]与[tex=0.429x1.0]JThLUuJ8WswSAPiYZWihWg==[/tex]的夹角：[tex=5.429x1.357]28vNNArDuRRnb+06piGt7g==[/tex]，[tex=6.143x1.357]Uqwu1QGYB2waFjV52ImPKg==[/tex] .
- 求向量[tex=0.571x0.786]c59+3vo0/Vn/FvNRhDRu5g==[/tex]与[tex=0.429x1.0]JThLUuJ8WswSAPiYZWihWg==[/tex]的夹角：[tex=5.429x1.357]2a1nHnVLv213QxcHtU3H+w==[/tex]，[tex=5.357x1.357]1D0C8TkZZ+4Sbb/nx0LsXA==[/tex] .
- 设[tex=0.571x0.786]c59+3vo0/Vn/FvNRhDRu5g==[/tex],[tex=0.429x1.0]JThLUuJ8WswSAPiYZWihWg==[/tex]是整数且不全为0，而[tex=9.857x1.214]hhHzRVDsWGXE+Yltfe39hDUdsl3Yzf9jGRPDg4wYEoJYR6eBGAfms1GUG8a2PN1l[/tex]，证明[tex=0.571x1.0]TcM6B5Wrs5vy9dWrxRPSdg==[/tex]是[tex=0.571x0.786]c59+3vo0/Vn/FvNRhDRu5g==[/tex]与[tex=0.429x1.0]JThLUuJ8WswSAPiYZWihWg==[/tex]的一个最大公因数当且仅当[tex=4.214x1.357]jI1oqbiyUHYU1xbNvvBdDK5ib01K7Vb7AmVkL7RKEyk=[/tex]
- 求以下各向量的散度及旋度([tex=0.571x0.786]c59+3vo0/Vn/FvNRhDRu5g==[/tex]，[tex=0.429x1.0]JThLUuJ8WswSAPiYZWihWg==[/tex]为常向量)：[br][/br][tex=2.5x1.357]evCJ2yvYK4YiSjLuMrVX7Q==[/tex]；
- 求以下各向量的散度及旋度([tex=0.571x0.786]c59+3vo0/Vn/FvNRhDRu5g==[/tex]，[tex=0.429x1.0]JThLUuJ8WswSAPiYZWihWg==[/tex]为常向量)：[br][/br][tex=4.714x1.286]X333hRNR02QjapTlKxQsZRKAagpx28BlcJvTwz8ur8w=[/tex]；