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乘法公式

乘法公式. 乘 法 分 配 律. ac. bc. 甲. 乙. ad. bd. 丙. 丁. a. b. c. d. ( a+b)(c+d)= ac + bc + ad + bd …(1). a. a 2. ab. 甲. 乙. ab. b 2. 丙. 丁. b. (a+b) 2 = a 2 + 2a b + b 2 ….(2) 叫做 和的平方公式. a. b. (a+b) 2 = a 2 + 2a b + b 2 … ( 2 ). 將 a=200 ， b=7 代入

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乘法公式

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  1. 乘法公式

  2. 乘 法 分 配 律 ac bc 甲 乙 ad bd 丙 丁 a b c d (a+b)(c+d)=ac+bc+ad+bd…(1)

  3. a a2 ab 甲 乙 ab b2 丙 丁 b (a+b)2 =a2+2ab+b2….(2) 叫做和的平方公式 a b (a+b)2=a2+2ab+b2 …(2)

  4. 將 a=200，b=7代入 (a+b)2 = a2 +2ab +b2 會得到什麼樣的式子? 利用公式(a+b)2 = a2 +2ab +b2, 算出1032

  5. 判斷下表中左邊的等式是否正確:

  6. b 藍色面積 b a-b ( a - b )2 a a-b a (a-b)2 =a2-2ab+b2….(3) 叫做差的平方公式 a2 a2-ab a2-ab+b2 a2-ab+b2-ab = a2-2ab+b2 (a-b)2=a2-2ab+b2…(3)

  7. 將 a=1000，b=7代入 (a-b)2 = a2 -2ab +b2 會得到什麼樣的式子? 利用公式(a-b)2 = a2 -2ab +b2, 算出9972

  8. 判斷下表中左邊的等式是否正確:

  9. (1) (a+b)(c+d)=ac+bc+ad+bd 乘法公式 (2) (a+b)2=a2+2ab+b2 (3) (a-b)2=a2+2ab+b2 (4) a2-b2 =? 一定要記住喔..

  10. 來源 景美國中

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