( a+b )( c+d ) = ac+ad+bc+bd
7
a b c d ac bc ad bd (a+b)(c+d) = ac+ad+bc+bd
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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 =. - PowerPoint PPT Presentation
Transcript of ( a+b )( c+d ) = ac+ad+bc+bd
a b
c
d
ac bc
ad bd
(a+b)(c+d) = ac+ad+bc+bd
a
a
b
b
a2
ab
ab
b2
(a+b)2 = a2+2ab+b2
(a - b)(a - b) = a2 -ab -ab +b2(a – b)2 = =a2 – 2ab+b2
a
a
b
b
a2 ab
(a-b)2 =
a-b
(a-b)2a-b
a2 -ab +b2 -ab
ab b2
(a - b)(a - b) = a2 -ab -ab +b2(a – b)2 = =a2 – 2ab+b2
(a-b)2 = a2-2ab+b2
2397
2(400 3)
2400 2 400 3 23
160000 2400 9
157609
2(0.99)
2(1 0.01)
21 2 1 0.01 20.01
1 0.02 0.0001
0.9801
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