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若X+Y=2,则约分|X^2-Y^2|/X-Y的结果.
人气:253 ℃ 时间:2020-06-22 01:12:25
解答
X+Y=2
|X^2-Y^2|/(X-Y)
=|(X+Y)(X-Y)|/(X-Y)
=|2(X-Y)|/(X-Y)
=±2(X-Y)/(X-Y)
=±2
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