Mathematics
Senior High
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因数分解です。僕の答えは合っているのでしょうか?
赤文字が模範解答です。
因数分解
ab-a-b+1
a(b-1)-b+1
-a (-b+1)-b+1
(-6+1) (-a+1)
(b-1) (a-1)
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ありがとうございます。