因式分解:x2y2﹣x2(y﹣1)2.
解:原式=x2y2﹣(y﹣1)2
=x2y+(y﹣1)y﹣(y﹣1)
=x2(y+y﹣1)(y﹣y+1)
=x2(2y﹣1).
Ann wants a bike her birthday present this year.
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