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数学
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(x-2y+3z)(x+2y-3z)
人气:246 ℃ 时间:2020-02-06 02:11:23
解答
(x-2y+3z)(x+2y-3z),
=x
2
-(2y-3z)
2
,
=x
2
-(4y
2
-12yz+9z
2
),
=x
2
-4y
2
+12yz-9z
2
.
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