1522完全平方公式(第1課時)-免費閱讀
【正文】 (2) 992. 【 解析 】 (1) 1022 = (100 +2) 2 = 1002 +2 100 2 + 22 = 10 000 +400 +4 = 10 404 (2) 992 = (100 1)2 = 1002 2 100 1+12 = 10 000 200 + 1 = 9 801 ？如果不正確，應(yīng)當(dāng)怎 樣改正？ 錯 錯 錯 錯 (x +y)2 =x2+2xy +y2 (x y)2 =x2 2xy +y2 (x y)2 =x2 2xy +y2 (x +y)2 =x2+2xy +y2 (1)(x+y)2=x2 +y2 (2)(x y)2 =x2 y2 (3) (x y)2 =x2+2xy +y2 (4) (x+y)2 =x2 +xy +y2 (1) (6a+5b)2 =36a2+60ab+25b2 (2) (4x3y)2
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