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因式分解18-8X^2+8XY-2Y^2
人气:102 ℃ 时间:2020-01-27 11:43:59
解答
18-8X^2+8XY-2Y^2
=18-2(4X^2-4XY+Y^2)
=2[9-(2X-Y)^2]
=2(3+2X-Y)(3-2X+Y)
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