1 ) 3-9-(-18)+9 = ?
2) -5-12+9-(-18)=?
3) (-5)(-10)+(-10)-(-30)=?
請列式和解釋一下~我唔識ar~~~
P.S. ( ) <<有咩用??
更新1:
急!!!快D唔該!!!!
負數加減計法
2010-07-25 11:23 pm
可否幫我??
1 ) 3-9-(-18)+9 = ?
2) -5-12+9-(-18)=?
3) (-5)(-10)+(-10)-(-30)=?
請列式和解釋一下~我唔識ar~~~
P.S. ( ) <<有咩用??
1 ) 3-9-(-18)+9 = ?
2) -5-12+9-(-18)=?
3) (-5)(-10)+(-10)-(-30)=?
請列式和解釋一下~我唔識ar~~~
P.S. ( ) <<有咩用??
回答 (4)
2010-07-25 11:52 pm
✔ 最佳答案
1) 3-9-(-18)+9=3-9+18+9
=3+18
=+21
2)-5-12+9-(-18)
=-5-12+9+18
=-17+27
=+10
3)(-5)(-10)+(-10)-(-30)
=(+50)-10+30
=50+20
=+70
負負得正你應該識喇
+ + = +
+ - = -
- + = -
- - = +
( )係用黎分開+ - 號架
因為+ - 號唔可以痴住黎用所以一定要加( ) 黎分隔佢地
參考: me~
2010-07-25 11:32 pm
1)3-9-(-18)+9
=3-9+18+9
=3+18-9+9
=3+18
=21
2)-5-12+9-(-18)
=-5-12+9+18
=9+18-5-12
=27-5-12
=22-12
=20
3)(-5)(-10)+(-10)-(-30)
=50-10+30
=40+30
=70
( ) <<冇用
P.S.負負得正，正負得負，負正得負，正正得正
=3-9+18+9
=3+18-9+9
=3+18
=21
2)-5-12+9-(-18)
=-5-12+9+18
=9+18-5-12
=27-5-12
=22-12
=20
3)(-5)(-10)+(-10)-(-30)
=50-10+30
=40+30
=70
( ) <<冇用
P.S.負負得正，正負得負，負正得負，正正得正
參考: 我
2010-07-25 11:29 pm
1 ) 3-9-(-18)+9 = 3-9+18+9=21
-(-18)=出面個負同入面個負等於正，因為負負得正，下面個兩題都係咁。
2) -5-12+9-(-18)=-5-12+9+18=10
3) (-5)(-10)+(-10)-(-30)=50-10+30=70
因為負負得正，負正得負，正負得負，正正得正
2010-07-25 15:31:51 補充：
如果你有其他數學要問，你可以pm問我
-(-18)=出面個負同入面個負等於正，因為負負得正，下面個兩題都係咁。
2) -5-12+9-(-18)=-5-12+9+18=10
3) (-5)(-10)+(-10)-(-30)=50-10+30=70
因為負負得正，負正得負，正負得負，正正得正
2010-07-25 15:31:51 補充：
如果你有其他數學要問，你可以pm問我
參考: 學過
2010-07-25 11:27 pm
1) 3-9-(-18)+9
=3-9+18+9
=3+18
=+21
2)-5-12+9-(-18)
=-5-12+9+18
=-17+27
=+10
3)(-5)(-10)+(-10)-(-30)
=(+50)-10+30
=50+20
=+70
=3-9+18+9
=3+18
=+21
2)-5-12+9-(-18)
=-5-12+9+18
=-17+27
=+10
3)(-5)(-10)+(-10)-(-30)
=(+50)-10+30
=50+20
=+70
收錄日期: 2021-04-23 23:42:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100725000051KK00697