Mathematics
Senior High
Resolved
想請問為什麼是正負5 有哪些情況下需要加上正負？
（這是同學的過程）
目切的直線方程式為 71-
Ikl
店
=
=5
• x-ry +5=-0. X-ry-5=1
$5
k = ± 5
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