a^2-4ab+2b^2
=a^2-4ab+4b^2-2b^2
=(a-2b)^2-2b^2
=(a-2b+√2b)(a-2b-√2b)
a2-4ab+2b2怎么因式分解
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a^2-4ab+2b^2
=a^2-4ab+4b^2-2b^2
=(a-2b)^2-2b^2
=(a-2b+√2b)(a-2b-√2b)