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数学
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(2X²-XY)-(X²-Y)怎么化简?
人气:284 ℃ 时间:2020-01-29 03:29:20
解答
(2X²-XY)-(X²-Y)
=2X²-XY-X²+Y
=2X²-X²-XY+Y
=X²-XY+Y
去括号,合并同类项即可
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