(2X²-XY)-(X²-Y)怎么化简?

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(2X²-XY)-(X²-Y)怎么化简?(2X²-XY)-(X²-Y)怎么化简?(2X²-XY)-(X²-Y)怎么化简?(2X²-

(2X²-XY)-(X²-Y)怎么化简?
(2X²-XY)-(X²-Y)怎么化简?

(2X²-XY)-(X²-Y)怎么化简?
(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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X^2-XY+Y

(2X²-XY)-(X²-Y)
=2X²-XY-X²+Y
=2X²-XY+Y