各位知識朋友 , 入黎幫我手 ar !!!
我有幾條數學問題唔識 , 幫手解答 ar( 數學F.1 )!!!!!!!!!!!!!!!( 要步驟 )
1.(a)(+2)+(-3)+(-1)
(b)(-5)+(-3)+(-1)
(c)(-2)-(-3)-(+4)
(d)(+5)-(-4)-(-3)
各位知識朋友 , 入黎幫我手 ar !!! ( 數學F.1 ) (2)
2007-09-08 8:16 pm
回答 (6)
2007-09-08 8:32 pm
1.(a) (+2)+(-3)+(-1)
2-3-1
is -2
(b) (-5)+(-3)+(-1)
-5-3-1
is -9
(c) (-2)-(-3)-(+4)
-2+3-4
is -3
(d) (+5)-(-4)-(-3)
5+4+3
is 12
幫唔幫到你?
2-3-1
is -2
(b) (-5)+(-3)+(-1)
-5-3-1
is -9
(c) (-2)-(-3)-(+4)
-2+3-4
is -3
(d) (+5)-(-4)-(-3)
5+4+3
is 12
幫唔幫到你?
2007-09-08 8:26 pm
1a) (+2)+(-3)+(-1)
=2-3-1
=-2
b) (-5)+(-3)+(-1)
=-5-3-1
=-9
c) (-2)-(-3)-(+4)
=-2+3-4
=-3
(d) (+5)-(-4)-(-3)
=5+4+3
=12
原因: 1)正正得正 ,, 正負得負 ,, 負負得正 (+ =正;- =負)
即系+(+2)=2 ,, +(-3)=-3 ,, -(-2) =2
你可以用計數機試下嫁,,
=2-3-1
=-2
b) (-5)+(-3)+(-1)
=-5-3-1
=-9
c) (-2)-(-3)-(+4)
=-2+3-4
=-3
(d) (+5)-(-4)-(-3)
=5+4+3
=12
原因: 1)正正得正 ,, 正負得負 ,, 負負得正 (+ =正;- =負)
即系+(+2)=2 ,, +(-3)=-3 ,, -(-2) =2
你可以用計數機試下嫁,,
參考: 自己
2007-09-08 8:26 pm
1.(a)
(+2)+(-3)+(-1)
=2-3-1
=-1-1
=-2
(b)
(-5)+(-3)+(-1)
=-5-3-1
=-8-1
=-9
(c)
(-2)-(-3)-(+4)
=-2+3-4
=1-4
=-3
(d)
(+5)-(-4)-(-3)
=5+4+3
=9+3
=12
(+2)+(-3)+(-1)
=2-3-1
=-1-1
=-2
(b)
(-5)+(-3)+(-1)
=-5-3-1
=-8-1
=-9
(c)
(-2)-(-3)-(+4)
=-2+3-4
=1-4
=-3
(d)
(+5)-(-4)-(-3)
=5+4+3
=9+3
=12
參考: me
2007-09-08 8:25 pm
(a) (+2)+(-3)+(-1)
= 2-3-1
= -2
(b) (-5)+(-3)+(-1)
= -5-3-1
= -9
(c) (-2)-(-3)-(+4)
= -2+3-4
= -3
(d) (+5)-(-4)-(-3)
= 5+4+3
= 12
= 2-3-1
= -2
(b) (-5)+(-3)+(-1)
= -5-3-1
= -9
(c) (-2)-(-3)-(+4)
= -2+3-4
= -3
(d) (+5)-(-4)-(-3)
= 5+4+3
= 12
參考: me
2007-09-08 8:24 pm
1.(a)(+2)+(-3)+(-1)
=+2-3-1
=+2-4
=-2
1.(b)(-5)+(-3)+(-1)
= -5-3-1
= -9
1.(c)(-2)-(-3)-(+4)
= -2+3-4
= -2-1
= -3
1.(d)(+5)-(-4)-(-3)
= +5+4+3
= +12
如喜歡,可省略步驟!=]
=+2-3-1
=+2-4
=-2
1.(b)(-5)+(-3)+(-1)
= -5-3-1
= -9
1.(c)(-2)-(-3)-(+4)
= -2+3-4
= -2-1
= -3
1.(d)(+5)-(-4)-(-3)
= +5+4+3
= +12
如喜歡,可省略步驟!=]
參考: 自己
2007-09-08 8:22 pm
a)(+2)+(-3)+(-1)=+2-3-1=-2
b)(-5)+(-3)+(-1)=-5-3-1=-9
(c)(-2)-(-3)-(+4)=-2+3-4=-3
(d)(+5)-(-4)-(-3)=+5+4+3=12
正正得正 +(+3)
負負得正 -(-3)
正負或負正得負+(-1)
b)(-5)+(-3)+(-1)=-5-3-1=-9
(c)(-2)-(-3)-(+4)=-2+3-4=-3
(d)(+5)-(-4)-(-3)=+5+4+3=12
正正得正 +(+3)
負負得正 -(-3)
正負或負正得負+(-1)
參考: myself
收錄日期: 2021-04-13 13:22:54
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070908000051KK01578