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¬å¼ï¼(a+/-b)^2=a^2+/-2ab+b^2 (a+b)(a-b)=a^2-b^2 ç»ä¹ p32 1.ï¼1ï¼x^2+6x+9 (2)4x^2+4xy+y^2 2.(1)x^2-6x+9 (2)4m^2- 4mn+n^2 3.(1)4m^2-4mn+n^2 (2)4m^2+ 4mn+n^2 4.ç±é¢æå¯ç¥ï¼æ¡å¸ä½¿è¾¹é¿ä¸ºï¼a+0.2ï¼ç±³çæ£æ¹å½¢ï¼æ
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