â(a²b²-2ab³+b⁴) (a<b)
=â[b²(a²-2ab+b²)]
=â[b²(a-b)²]
=b(a-b)
=ab-b²è¿½é®
=â[b²(a²-2ab+b²)]
=â[b²(a-b)²]
=b(a-b)
=ab-b²è¿½é®
请é®æ¯ä¸æ¯éäºï¼æ¯ä¸æ¯åºè¯¥æ¯ab-b2
追çab-b2æ¯å 为bçå¹³æ¹ç2ï¼åºåå¨bçå³ä¸è§ä¸ï¼è没æè¿æ ·åã
追é®æåå¾æ°æ¯ä¸æ¯ab-bçå¹³æ¹2ï¼ä½ çå¾æ°æ¯ab+bçå¹³æ¹2
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