負數與正數

2008-09-17 1:02 am
1)(-7)-(-2)+(-6)=
=
=

2)(+5)-(+9)+(+17)=
=
=

3)(+5)+(-8)-(+12)+(-23)=
=
=

4)(+1.6)+(-2.1)-(3.1)-(-19)=
=
=
5)(-2又3分之2)+(4又3分之1)-(+6又2分之1)-(-2分之3)=
=
=

6)(0.2)-(+4又10分之3)+(+2.7)+(-6又5分之3)=
=
=

7)(-5)-[(-2)+(+8)]-(-14)=
=
=


8)(+2.4)-[(-5.8)+(-6.4)]=
=
=

回答 (3)

2008-09-17 2:22 am
✔ 最佳答案
1)(-7)-(-2) (-6)
=-7 2-6
=-11

2)( 5)-( 9) ( 17)
=5-9 17
=13

3)( 5) (-8)-( 12) (-23)
=5-8-12-23
=-38

4)( 1.6) (-2.1)-(3.1)-(-19)
=1.6-2.1-3.1 19
=15.4

5)(-2又3分之2) (4又3分之1)-( 6又2分之1)-(-2分之3)
=-2又3分之2 4又3分之1-6又2分之1 2分之3
=(-3又3分之1)

6)(0.2)-( 4又10分之3) ( 2.7) (-6又5分之3)
=0.2-4又10分之3 2.7-6又5分之3
=-8

7)(-5)-[(-2) ( 8)]-(-14)
=-5 2-8 14
=3

8)( 2.4)-[(-5.8) (-6.4)]
=2.4 5.8 6.4
=14.6
參考: Myself
2008-09-17 3:42 am
1)(-7)-(-2) (-6)
=-7 2-6
=-11

2)( 5)-( 9) ( 17)
=5-9 17
=13

3)( 5) (-8)-( 12) (-23)
=5-8-12-23
=-38

4)( 1.6) (-2.1)-(3.1)-(-19)
=1.6-2.1-3.1 19
=15.4

5)(-2又3分之2) (4又3分之1)-( 6又2分之1)-(-2分之3)
=-2又3分之2 4又3分之1-6又2分之1 2分之3
=(-3又3分之1)

6)(0.2)-( 4又10分之3) ( 2.7) (-6又5分之3)
=0.2-4又10分之3 2.7-6又5分之3
=-8

7)(-5)-[(-2) ( 8)]-(-14)
=-5 2-8 14
=3

8)( 2.4)-[(-5.8) (-6.4)]
=2.4 5.8 6.4
=14.6
2008-09-17 2:33 am
1) (-7)-(-2)+(-6)
=-7+2-6
=-5-6
=-11//

2)(+5)-(+9)+(+17)
=5-9+17
=-4+17
=13//

3)(+5)+(-8)-(+12)+(-23)
=5-8-12-23
=-13-12-23
=-25-23
=-48//

4)(+1.6)+(-2.1)-(3.1)-(-19)
=1.6-2.1-3.1+1.9
=-0.5-3.1+1.9
=-3.6+1.9
=-1.7//

5)(-2又3分之2)+(4又3分之1)-(+6又2分之1)-(-2分之3)=
=-2又3分2+4又3分1-6又2分1+2分3
=2又3分3-6又2分4
=3-8
=-5//

6)(0.2)-(+4又10分之3)+(+2.7)+(-6又5分之3)=
=0.2-4又10分3+2.7-6又5分3
=-4又10分3-6又5分3+0.2+2.7
=-4又10分3-6又10分6+2.9
=-10又10分9+2.9
=-10又10分9+2又10分9
=-8又10分9//

7)(-5)-[(-2)+(+8)]-(-14)
=-5-(-2+8)+14
=-5-(+6)+14
=-5-6+14
=-11+14
=3//

8)(+2.4)-[(-5.8)+(-6.4)]
=2.4-(-5.8-6.4)
=2.4-(-12.2)
=2.4+12.2
=14.6//

2008-09-16 18:35:47 補充:
第3題計錯
3)(+5)+(-8)-(+12)+(-23)
=5-8-12-23
=-3-12-23
=-15-23
=-38//
參考: 自己. 負負得正. 正負得負.


收錄日期: 2021-04-20 22:56:46
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