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
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