a²-b²-c²+2ab等于几

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a²-b²-c²+2ab等于几a²-b²-c²+2ab等于几a²-b²-c²+2ab等于几a²+b&

a²-b²-c²+2ab等于几
a²-b²-c²+2ab等于几

a²-b²-c²+2ab等于几
a²+b²-c²+2ab
=(a+b)²-c²
=(a+b+c)(a+b-c)