(a^2+b^2)^2-4a^2b^2 =a^4+2a^2b^2+b^4-4a^2b^2 =a^4+b^4-2a^2b^2 =(a^2-b^2)^2 这样做对吗
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![(a^2+b^2)^2-4a^2b^2 =a^4+2a^2b^2+b^4-4a^2b^2 =a^4+b^4-2a^2b^2 =(a^2-b^2)^2 这样做对吗](/uploads/image/z/2764924-52-4.jpg?t=%28a%5E2%2Bb%5E2%29%5E2-4a%5E2b%5E2+%3Da%5E4%2B2a%5E2b%5E2%2Bb%5E4-4a%5E2b%5E2+%3Da%5E4%2Bb%5E4-2a%5E2b%5E2+%3D%28a%5E2-b%5E2%29%5E2+%E8%BF%99%E6%A0%B7%E5%81%9A%E5%AF%B9%E5%90%97)
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(a^2+b^2)^2-4a^2b^2 =a^4+2a^2b^2+b^4-4a^2b^2 =a^4+b^4-2a^2b^2 =(a^2-b^2)^2 这样做对吗
(a^2+b^2)^2-4a^2b^2 =a^4+2a^2b^2+b^4-4a^2b^2 =a^4+b^4-2a^2b^2 =(a^2-b^2)^2 这样做对吗
(a^2+b^2)^2-4a^2b^2 =a^4+2a^2b^2+b^4-4a^2b^2 =a^4+b^4-2a^2b^2 =(a^2-b^2)^2 这样做对吗
(a^2+b^2)^2-4a^2b^2
=a^4+2a^2b^2+b^4-4a^2b^2
=a^4+b^4-2a^2b^2
=(a^2-b^2)^2
对
可以继续做:
=(a+b)^2 (a-b)^2