因式分解,谢谢了
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(1)=y^4 + 2x²y² + x^4 - 4x²y²
=y^4 - 2x²y² + x^4
=(y² - x²)²
(2)=(a+1)² - 2(a+1)(a-1) + (a-1)²
=[(a+1) - (a-1)]²
=(a + 1 - a + 1)²=2²
(3)=[3(a-b)]² + 2•3(a-b)•2(a+b)
+ [2(a+b)]²
=[3(a-b) + 2(a+b)]²
=(3a - 3b + 2a + 2b)²
=(5a - b)²
=y^4 - 2x²y² + x^4
=(y² - x²)²
(2)=(a+1)² - 2(a+1)(a-1) + (a-1)²
=[(a+1) - (a-1)]²
=(a + 1 - a + 1)²=2²
(3)=[3(a-b)]² + 2•3(a-b)•2(a+b)
+ [2(a+b)]²
=[3(a-b) + 2(a+b)]²
=(3a - 3b + 2a + 2b)²
=(5a - b)²
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