Mathematics
Senior High
Resolved
なぜ、これが成り立つのでしょうか？
∙E E OS V+01-8)
T+
←2直線
aix+b₁y+c₁=0
a₂x+b₂y+c₂=0
について
F1a₁b₂-a₂b₁=0
a₁a₂+b₁b₂=0
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