[中學] 判定三向量兩兩互相垂直的條件
若非零任三不共面向量v,a,b,c 滿足
|v|^2 = (v \cdot a/|a|)^2 +(v\cdot b/ |b|)^2 +(v\cdot c / |c| )^2
則
a,b,c 兩兩互相垂直?!
謝謝!
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