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( a+b )( c+d ) = ac+ad+bc+bd

a. b. c. ac. bc. d. ad. bd. ( a+b )( c+d ) = ac+ad+bc+bd. a. b. a. a 2. ab. b. ab. b 2. ( a+b ) 2 = a 2 +2ab+b 2. (a – b) 2 =. (a - b )( a - b ) =. =a 2 – 2ab+b 2. a 2. - ab. - ab. + b 2. b. a-b. a. (a-b) 2. a-b. a. a 2. ab. b. ab. b 2. (a – b) 2 =.

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( a+b )( c+d ) = ac+ad+bc+bd

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  1. a b c ac bc d ad bd (a+b)(c+d) = ac+ad+bc+bd

  2. a b a a2 ab b ab b2 (a+b)2 = a2+2ab+b2

  3. (a – b)2 = (a - b)(a - b) = =a2– 2ab+b2 a2 -ab -ab +b2

  4. b a-b a (a-b)2 a-b a a2 ab b ab b2 (a – b)2 = (a - b)(a - b) = =a2– 2ab+b2 a2 -ab -ab +b2 (a-b)2= a2 -ab +b2 -ab

  5. (a-b)2= a2-2ab+b2

  6. 練習

  7. 小考

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