3X²-(X²+Y²)-Y² 等于多少?

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3X²-(X²+Y²)-Y²等于多少?3X²-(X²+Y²)-Y²等于多少?3X²-(X²+Y

3X²-(X²+Y²)-Y² 等于多少?
3X²-(X²+Y²)-Y² 等于多少?

3X²-(X²+Y²)-Y² 等于多少?
=2x^2-2y^2
=2(x-y)(x+y)