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  5. 這題怎麼算 國一數學範圍 求協助！
Mathematics
初中
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這題怎麼算 國一數學範圍 求協助！

4.若3x:5=(y+1):219x-8y-7=0,則x-y? (A) 6 (B) 7 (C) 8 (D) 9

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