Mathematics
Senior High
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解答解説をお願いします。
1
A = x+y+z, B = 2x-y-z, C=x-y-3z ≥ 73.
次の式を計算せよ。
(1) 2(AB) (B - C)
(2) 3(A + C)-2(2B - A)
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ありがとうございます。