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z的2次方-x的2次方+2xy-y的2次方
人气:288 ℃ 时间:2020-10-01 11:00:17
解答
z²-x²+2xy-y²
=z²-(x²-2xy+y²)
=z²-(x-y)²
=[z+(x-y)][z-(x-y)]
=(z+x-y)(z-x+y)
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