(3x+4y)²-(x-4y)²=多少?

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(3x+4y)²-(x-4y)²=多少?

(3x+4y)²-(x-4y)²=多少?
(3x+4y)²-(x-4y)²=多少?

(3x+4y)²-(x-4y)²=多少?