分解因式:9(x-y)²-y²
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分解因式:9(x-y)²-y²
分解因式:9(x-y)²-y²
分解因式:9(x-y)²-y²
解
9(x-y)²-y²
=[3(x-y)]²-y²
=[3(x-y)-y][3(x-y)+y]
=(3x-4y)(3x-2y)
分解因式:9(x-y)²-y²
分解因式:9(x-y)²-y²
分解因式:9(x-y)²-y²
解
9(x-y)²-y²
=[3(x-y)]²-y²
=[3(x-y)-y][3(x-y)+y]
=(3x-4y)(3x-2y)