计算 [(x-y)²+(x+y)²](x²-y²)
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计算[(x-y)²+(x+y)²](x²-y²)计算[(x-y)²+(x+y)²](x²-y²)计算[(x-y)
计算 [(x-y)²+(x+y)²](x²-y²)
计算 [(x-y)²+(x+y)²](x²-y²)
计算 [(x-y)²+(x+y)²](x²-y²)
[(x-y)²+(x+y)²](x²-y²) =(x²-2xy+y²+x²+2xy+y²)(x²-y²)
=2(x²+y²)(x²-y²)
=2(x⁴-y⁴)
=2x⁴-2y⁴
=2(x²-y²) ²
