標題:
F. 2 Maths-Factorization by using identities(兩題=+40點)
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F. 2 Maths-Questions about factorization by using identities (最佳解答取40點) Factorize the following expressions. 1. b^2+ab+1/4a^2 2. 3+9/a^2+a^2/4 Please show your working steps clearly and explain them briefly. Tell me about the techniques to deal with these problems too if you can.
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最佳解答:
1)b^2+ab+1/4a^2 =^2+2(a/2)(b)+(a/2)^2 =b-0.5a)^2 其實一眼睇到=.=" 2)3+9/a^2+a^2/4 (3/a)^2+2(3/a)+(a/2)^2 =(3/a+a/2)^2 2006-12-19 22:40:45 補充： 有d字唔見左1)b^2 ab 1/4a^2=b^2 2(a/2)(b) (a/2)^2=(b-0.5a)^2 其實一眼睇到=.="2)3 9/a^2 a^2/4(3/a)^2 2(3/a) (a/2)^2=(3/a a/2)^2都係一眼就睇到=.="其實d step係睇到之後再想出來
其他解答:
1. b^2+ab+1/4a^2
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