Mathematics
Junior High
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解き方教えてください🙇🏻♀️答えはa=2です！
(7) 3点A(-1,7) B (55) C (a, 1) が一直線上にあるとき、 αの値を求めなさい。
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解き方教えてください🙇🏻♀️答えはa=2です！
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aが二つあってわかりずらいかもしれませんが、、