å
¬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
é¢ç§¯ä¸ºï¼a+0.2ï¼^2=(a^2+0.4a+0.04)(å¹³æ¹ç±³ï¼
ä¹ é¢P33
1.ï¼1ï¼a^2-4b^2 ï¼2ï¼4a^2-25b^2(3)4a^2-9b^2 (4)1/4b^2-1/9a^2
2.(1)9a^2+6ab+b^2 (2)4a^2+4/3ab+1/9b^2 (3)-4a^2-4a-1
3.4a^2-16ab+16b^2 (2)1/4a^2-1/3ab+1/9b^2
4.(1)9.3(2)25.5(3)2ab(4)4xy
5ç±é¢æå¯ç¥ï¼å·æ³æ°´æ± æ¯è¾¹é¿ä¸ºï¼a-2b)ç±³çæ£æ¹å½¢ï¼æ
é¢ç§¯ä¸ºï¼a-2bï¼^2=(a^2-4ab+4b^2)(å¹³æ¹ç±³ï¼
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