(a+b-c)(a-b+c)-(a-b-c)(a+b+c)等于多少?完整解法

2024-11-16 21:25:39
推荐回答(5个)
回答1:

=[a+(b一C)][a一(b一c)]一[a一(b+C)][a+(b+C)]
=a²一(b一C)²一[a²一(b+c)²]
=a²一b²+2bc一c²一(a²一b²一2bc一C²)
=a²一b²一C²+2bc一a²+b²+2bc+c²
=4bc

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