F.1 MATHS
2012-12-11 10:40 pm
When removing the brackets from a subtracted polynomial, you change all signs. Why?
回答 (1)
2012-12-11 10:56 pm
✔ 最佳答案
因為之後嘅加同減係好受bracket前面嘅+/-影響。example:(2x+3y-4c)-(3c+4h-7s)
=2x+3y-4c-3c-4h+7s
Notes: (-)(+)=(-)
(-)(-)=(+)
(+)(+)=(+)
(+)(-)=(-)
收錄日期: 2021-04-13 19:10:35
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https://hk.answers.yahoo.com/question/index?qid=20121211000051KK00129