Mathematics
Junior High
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全然わかりません!w誰か教えてください!明日提出なので急ぎめでお願いしますm(_ _)m

4 次の計算をしなさい。 (1) 6y-7y (2) - 6.2+5.r-x (3)(a-4)+(3a+5) (4)(-2a-4)- (4-2a)

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