计算(x-y)²（x+y）²
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计算(x-y)²（x+y）²计算(x-y)²（x+y）²计算(x-y)²（x+y）²(x-y)²(x+y)²=[(x-y
计算(x-y)²（x+y）²
计算(x-y)²（x+y）²
计算(x-y)²（x+y）²
(x-y)²(x+y)²
=[(x-y)(x+y)]²
=(x²-y²)²
=x⁴-2x²y²+y⁴
=[(x-y)(x+y)]^2=(x^2-y^2)^2=x^4-2x^2y^2+y^4