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  5. (x-y)²-9 どのように因数分解しますか
Mathematics
Junior High
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(x-y)²-9
どのように因数分解しますか

Answers

✨ Best Answer ✨

user
user

9=3²
よって
(x-y)²-3²

A²-B²=(A+B)(A-B)より
(x-y+3)(x-y-3)

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