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這是國中題目?就算今天剛學的,也應該很簡單吧,怎麼也不會啊,上課怎麼都不聽. ∵∠C=90°,b=m,∠A=30° ∴設a=x,則c=2x, 由c²;=a²;+b²;得 4x²;=x²;+m²; ∴x²;=m²;/3 x=(√3/3)m ∴a=(√3/3)m c==(2√3/3)m
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