大哥大姐们! 求解法! 关于 向量和 矩阵的! 好了高分追加! 谢谢谢谢!副中英文版Question: pick any numbers that add to x+y+z=0. Find the angle between your vector v=(x,y,z) and the vector w=(z,x,y) Challenge question: Explain
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![大哥大姐们! 求解法! 关于 向量和 矩阵的! 好了高分追加! 谢谢谢谢!副中英文版Question: pick any numbers that add to x+y+z=0. Find the angle between your vector v=(x,y,z) and the vector w=(z,x,y) Challenge question: Explain](/uploads/image/z/13725351-63-1.jpg?t=%E5%A4%A7%E5%93%A5%E5%A4%A7%E5%A7%90%E4%BB%AC%21+%E6%B1%82%E8%A7%A3%E6%B3%95%21+%E5%85%B3%E4%BA%8E+%E5%90%91%E9%87%8F%E5%92%8C+%E7%9F%A9%E9%98%B5%E7%9A%84%21+%E5%A5%BD%E4%BA%86%E9%AB%98%E5%88%86%E8%BF%BD%E5%8A%A0%21+%E8%B0%A2%E8%B0%A2%E8%B0%A2%E8%B0%A2%21%E5%89%AF%E4%B8%AD%E8%8B%B1%E6%96%87%E7%89%88Question%3A+pick+any+numbers+that+add+to+x%2By%2Bz%3D0.+Find+the+angle+between+your+vector+v%3D%28x%2Cy%2Cz%29+and+the+vector+w%3D%28z%2Cx%2Cy%29+Challenge+question%3A+Explain)
大哥大姐们! 求解法! 关于 向量和 矩阵的! 好了高分追加! 谢谢谢谢!副中英文版Question: pick any numbers that add to x+y+z=0. Find the angle between your vector v=(x,y,z) and the vector w=(z,x,y) Challenge question: Explain
大哥大姐们! 求解法! 关于 向量和 矩阵的! 好了高分追加! 谢谢谢谢!副中英文版
Question: pick any numbers that add to x+y+z=0. Find the angle between your vector v=(x,y,z) and the vector w=(z,x,y) Challenge question: Explain why (v*w)/┃v┃w┃is always -1/2
中文版: 找任意个数使得x+y+z=0, 找出向量v=(x,y,z) 和w=(z,x,y) 中的的夹角,挑战问题:解释为什么(v*w)/┃v┃w┃总是等于-1/2
大哥大姐们! 求解法! 关于 向量和 矩阵的! 好了高分追加! 谢谢谢谢!副中英文版Question: pick any numbers that add to x+y+z=0. Find the angle between your vector v=(x,y,z) and the vector w=(z,x,y) Challenge question: Explain
(v*w)=xy+yz+zx
┃v┃w┃=x^2+y^2+z^2=(x+y+z)^2-2xy-2yz-2xz=-2(xy+yz+zx)
so,(v*w)/┃v┃w┃=-1/2