1. Which of the following is not an identity? ^2= to the power 2
A. 4ab=(a+b)^2-(a-b)^2
B. (a-b)(a+b)(a^2+b^2)=a^4-b^4
C. (a^2+b^2)^2=a^4+b^4
D. (a^2+b^2-ab)(a^2+b^2+ab)=a^4+b^4+a^2b^2
2.Factorize x^2+y^2-z^2-2xy
3.Which of the following are consumers?
mushroom grasshopper apple
4.___________may also cause addiction to cigarette smoking.
F2 Maths,Science
2009-12-18 9:05 pm
回答 (2)
2009-12-18 11:39 pm
✔ 最佳答案
1. C (a^2+b^2)^2=a^4+b^4 is not an identity2.x^2+y^2-z^2-2xy
=(x-y+z)(x-y-z)
3. grasshopper is consumer,as they mostly eat worms.
4 Nicotine may also cause addiction to cigarette smoking
2009-12-18 9:32 pm
1. C
(a^2+b^2)^2= a^4+2*a^2*b^2+b^4
2. x^2+y^2-z^2-2xy
=(x-y)^2-z^2
=(x-y+z)(x-y-z)
3. grasshopper as it will eat something
4. ?????
2009-12-18 13:34:44 補充：
4. Nicotine may also cause addiction to cigarette smoking
(a^2+b^2)^2= a^4+2*a^2*b^2+b^4
2. x^2+y^2-z^2-2xy
=(x-y)^2-z^2
=(x-y+z)(x-y-z)
3. grasshopper as it will eat something
4. ?????
2009-12-18 13:34:44 補充：
4. Nicotine may also cause addiction to cigarette smoking
參考: myself
收錄日期: 2021-04-13 16:59:42
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https://hk.answers.yahoo.com/question/index?qid=20091218000051KK00509