A) expand (x-2)^2
B) Hence,expand (2-a-b)^2
註：係ｉｄｅｎｔｉｔｉｅｓ
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2008-04-05 6:41 am
回答 (1)
2008-04-05 6:54 am
✔ 最佳答案
A) (x-2)^2=x^2-2x+4B) (2-a-b)^2=[2-(a+b)]^2
=4-4(a+b)+(a+b)^2
=4-4a-4b+a^2+2ab+b^2
收錄日期: 2021-04-29 20:26:57
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