1>.因式分解(4a+5b)² - (5a-4b)²2>.因式分解 x² - y² + 10x + 253>.化简后求值(1/2x+1/3y)² - (1/3x+1/2y)² - (5/6x+5/6y)(1/6x-1/6y)其中2¹º = x² = 4的y次方4>.(x-1)(x的n-1次方 + x的n-2次方

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