(x-y)(x+y)( )=x的四次方-2x的二次方y的二次方+y的四次方

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(x-y)(x+y)( )=x的四次方-2x的二次方y的二次方+y的四次方
(x-y)(x+y)( )=x的四次方-2x的二次方y的二次方+y的四次方

(x-y)(x+y)( )=x的四次方-2x的二次方y的二次方+y的四次方
x⁴-2x²y²+y⁴
=(x²-y²)²
=[(x+y)(x-y)]²
=(x-y)²(x+y)²
(x-y)(x+y)( (x-y)(x+y) )=x⁴-2x²y²+y⁴

(x-y)(x+y)(x^2-y^2)=(x^2-y^2)(x^2-y^2)=x^4-2x^2y^2+y^4

2x-3xy+2y/x+2xy+y=1(分式上下同时除以xy) a的二次方/a的四次方+a的二次方+1=1/2 (分时上下同时除以a平方)

等式右边=x^4-2x²y²+y^4
=(x²-y²)²
等式左边=(x-y)(x+y)( )
=(x²-y²)( )
则 ( )内应填为:( x²-y² )