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在实数范围内因式分解:x方+2xy-5y方
人气:328 ℃ 时间:2020-06-14 22:22:50
解答
x方+2xy-5y方
=(x²+2xy+y²)-6y²
=(x+y)²-(√6y)²
=(x+y+√6y)(x+y-√6y)
=[x+(1+√6)y][x+(1-√6)y]
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