4(x+y)^2-12(x+y)(x-y)+9(+y)^2因式分解,

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(a+b)(a-2b)-(a+4b)-2
=(a+b)(a-2b)-(a+4b)-(a-2b)+(a-2b)-2
=(a+b)(a-2b)-2(a+b)+(a-2b)-2
=(a+b)(a-2b-2)+(a-2b-2)
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4(2x^2-x+1)(x^2-2x+3)-(3x^2-3x+4)^2
=4(2x^2-x+1)(x^2-2x+3)-[(2x^2-x+1)+(x^2-2x+3)]^2
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参考:
令a=2x²-x+1
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则3x²-3x+4=a+b
所以原式=4ab-(a+b)²
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利用平方差公式:a²-b²=(a+b)(a-b)
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