计算【(x+y)²+(x-y)²】(2x²-2y²)
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计算【(x+y)²+(x-y)²】(2x²-2y²)
计算【(x+y)²+(x-y)²】(2x²-2y²)
计算【(x+y)²+(x-y)²】(2x²-2y²)
【(x+y)²+(x-y)²】(2x²-2y²)=【2(x²+y²)】(2x²-2y²)=4(x4-y4)
公式(a-b)(a+b)=a2-b2
=﹙2X²+2Y²﹚﹙2X²-2Y²﹚
=﹙2X²﹚²-﹙2Y²﹚²
=四乘以X的四次方 - 四乘以Y的四次方