Maths

2007-08-26 11:10 pm
(-2)-(-4)+(-3)-5,if you answer me , you should explain me why.

回答 (6)

2007-08-26 11:21 pm
✔ 最佳答案
(-2)-(-4)+(-3)-5
= -2+4-3-5
= -6

解釋:
首先你要拆括號,然後就慢慢計算下去便得啦!
拆括號的方法:
(+)(+)=(+)/正正得正

(+)(-)=(-)/正負得負

(-)(+)=(-)/負正得負

(-)(-)=(+)/負負得正
參考: ME
2007-08-27 1:09 am
(-2)-(-4)+(-3)-5
= -2+4-3-5
= -6

Because : 要拆完括號先計
     負負得正(-)(-)=(+) 
     正正得正(+)(+)=(+) 
     負正得負(-)(+)=(-) 
     正負得負(+)(-)=(-)
參考: me
2007-08-26 11:24 pm
the answer is -6
你有冇聽過類似「負負得正」既口訣?
負負得正,正正得正,正負得負,負正得負。
(-2)-(-4) = -2+4 =2
(2)+(-3) = 2-3 = -1
(-1)-5 = -6
參考: me
2007-08-26 11:22 pm
answer is -6.

remember
1.負負得正
2.正負得負

so,
(-2)-(-4)+(-3)-5
= -2+4-3-5 ---->( +4 because 負負得正, so - (-4)=+4 ; -3 because 正負得負, so +(-3)=-3)
=2-3-5
=-1-5
=-6

希望你明白
參考: ME
2007-08-26 11:19 pm
(-2)-(-4)+(-3)-5
=(-2)+4-3-5
=-2+4-3-5
=-6
2007-08-26 11:18 pm
= -2+4-3-5
= 2-3-5
= -1-5
= -6


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