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【(2/1x-y)平方+(2/1x+y)平方】(2/1x的平方--2y平方)
=(1/4x²-xy+y²+1/4x²+xy+y²(1/2x²-2y²)
=(1/2x²+2y²)(1/2x²-2y²)
=1/4x^4-4y^4
x^4是想的4次方
y^4是y的4次方
=(1/4x²-xy+y²+1/4x²+xy+y²(1/2x²-2y²)
=(1/2x²+2y²)(1/2x²-2y²)
=1/4x^4-4y^4
x^4是想的4次方
y^4是y的4次方
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