因式分解4(x+2y)^2-9(x-y)^2
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4(x+2y)²-9(x-y)²
=[2(x+2y)]²-[3(x-y)]²
=[2(x+2y)+3(x-y)][2(x+2y)-3(x-y)]
=(5x+y)(-x+7y)
=-(5x+y)(x-7y)
=[2(x+2y)]²-[3(x-y)]²
=[2(x+2y)+3(x-y)][2(x+2y)-3(x-y)]
=(5x+y)(-x+7y)
=-(5x+y)(x-7y)
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