把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得

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把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得

把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得
把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得

把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得
9(x-y)²+12(x²-y²)+4(x+y)²
=[3(x-y)]²+2×3(x-y)×2(x+y)+[2(x+y)]²
=[3(x-y)+2(x+y)]²
=(5x-y)²