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计算:(a+b-c)(a-b-c)=______.
人气:212 ℃ 时间:2020-05-14 19:16:38
解答
原式=[(a-c)+b][(a-c)-b]
=(a-c)
2
-b
2
=a
2
-2ac+c
2
-b
2
.
故答案为a
2
-2ac+c
2
-b
2
.
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