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数学
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分解因式:x
2
-6x+9-y
2
人气:228 ℃ 时间:2020-06-26 03:05:26
解答
x
2
-6x+9-y
2
,
=(x-3)
2
-y
2
,
=(x-3+y)(x-3-y),
=(x+y-3)(x-y-3).
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