(x-y)(x+y)( )=x四次方-2x²y²+y四次方

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(x-y)(x+y)()=x四次方-2x²y²+y四次方(x-y)(x+y)()=x四次方-2x²y²+y四次方(x-y)(x+y)()=x四次方-2x

(x-y)(x+y)( )=x四次方-2x²y²+y四次方
(x-y)(x+y)( )=x四次方-2x²y²+y四次方

(x-y)(x+y)( )=x四次方-2x²y²+y四次方
(x-y)(x+y)(x²-y²)=x的4次方-2x²y²+y的4次方



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(x-y)(x+y)(x²-y² )=x四次方-2x²y²+y四次方

(x-y)(x+y)(x²-y² )=x四次方-2x²y²+y四次方

(x-y)(x+y)( x²-y²)=x四次方-2x²y²+y四次方

x⁴-2x²y²+y⁴=(x²-y²)²=(x+y)²(x-y)²
所以(x-y)(x+y)(x²-y²)=x⁴-2x²y²+y⁴

如果不懂,请追问,祝学习愉快!

(x-y)(x+y) = x² - y²
x四次方-2x²y²+y四次方 = (x² - y²)²
所以前面少一个 x² - y²
答案:
(x-y)(x+y)( x² - y² )=x四次方-2x²y²+y四次方

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