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因式分解4x²+4xy-y²
4x²+4xy-y² ,答案是[2x+(1+√2)y][2x+(1-√2)y]为什么
人气:476 ℃ 时间:2020-01-31 10:00:04
解答
4x²+4xy-y²
=4x²+4xy+y² -2y²
=(2x+y)² -2y²
=(2x+y+√2y)(2x+y-√2y)
=[2x+(1+√2)y][2x+(1-√2)y]
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