正數和負數的加減法

1)1-2 3-4 5-6
=1 3 5-2-4-6
=9-12
= -3

2)1-2-3-4 5-6
=1 5-2-3-4-6
=6-15
= -9

3)4 5-3-7-11-8 9-6
=4 5 9-3-7-11-8-6
=18-35
= -17

4)8-5-9 4-7-11 12 10
=8 4 12 10-5-9-7-11
=34-32
= 2

5)-7-15 19 24 11-3-22 8
=19 24 11 8-7-15-3-22
=62-47
= 15

6)-12 5-13 14-27-3 9-6
=5 14 9-12-13-27-3-6
=28-61
= -33

7)-9-14 3 4 15-20 2-21
=3 4 15 2-9-14-20-21
=24-64
= -40

8)15-3-18 9-3-6 4-34
=15 9 4-3-18-3-6-34
=28-64
= -36

9)-12 5 30 9-27-33 2 24
=5 30 9 2 24-12-27-33
=70-72
= -2

10)7-17 29-12-9-5 33-26
=7 29 33-17-12-9-5-26
=69-69
= 0

2008-09-12 21:33:40 補充：
+

2008-09-12 21:35:05 補充：
唔好意思，數字之間嘅空格係＋，唔知點解打唔到出尼

1)1-2+3-4+5-6
= -1+3-4+5-6
= 2-4+5-6
= -2+5-6
= 3-6
= -3

2)1-2-3-4+5-6
= -1-3-4+5-6
= -4-4+5-6
= -8+5-6
= -3-6
= -9

3)4+5-3-7-11-8+9-6
= 9-3-7-11-8+9-6
= 6-7-11-8+9-6
= -1-11-8+9-6
= -12-8+9-6
= -20+9-6
= -11-6
= -17

4)8-5-9+4-7-11+12+10
= 3-9+4-7-11+12+10
= -6+4-7-11+12+10
= -2-7-11+12+10
= -9-11+12+10
= -20+12+10
= -8+10
= 2


5)-7-15+19+24+11-3-22+8
= -22+19+24+11-3-22+8
= -3+19+24+11-3-22+8
= 16+24+11-3-22+8
= 40+11-3-22+8
= 51-3-22+8
= 48-22+8
= 26+8
=34

6)-12+5-13+14-27-3+9-6
= -7-13+14-27-3+9-6
= -20+14-27-3+9-6
= -6-27-3+9-6
= -33-3+9-6
= -36+9-6
= -27-6
= -33

7)-9-14+3+4+15-20+2-21
= -23+3+4+15-20+2-21
= -20+4+15-20+2-21
= -16+15-20+2-21
= -1-20+2-21
= -21+2-21
=-19-21
=-40

8)15-3-18+9-3-6+4-34
= 12-18+9-3-6+4-34
= -6+9-3-6+4-34
= 3-3-6+4-34
= 0-6+4-34
= -6+4-34
= -2-34
= -36

9)-12+5+30+9-27-33+2+24
= -7+30+9-27-33+2+24
= 23+9-27-33+2+24
= 32-27-33+2+24
= 5-33+2+24
= -28+2+24
= -26+24
= -2

10)7-17+29-12-9-5+33-26
= -10+29-12-9-5+33-26
= 19-12-9-5+33-26
= 7-9-5+33-26
= -2-5+33-26
= -7+33-26
= 26-26
= 0


提示:
正=(+) 負=(-)

正正得正
正負得負
負負得正
負正得負

正數和負數的加減法
1)1-2+3-4+5-6
= 1+3+5-(2+4+6)
= 9-12
= -3

2)1-2-3-4+5-6
= 1+5-(2+3+4+6)
= 6-15
= -9

3)4+5-3-7-11-8+9-6
= 4+5+9 - (3+7+11+8+6)
= 18 - 35
= -17

4)8-5-9+4-7-11+12+10
= 8+4+12+10-(5+9+7+11)
= 34 - 32
= 2

5)-7-15+19+24+11-3-22+8
= 19+24+11+8 - (7+15+3+22)
= 62 - 47
= 15

6)-12+5-13+14-27-3+9-6
= 5+14+9-(12+13+27+3+6)
= 28 - 61
= -33

7)-9-14+3+4+15-20+2-21
= 3+4+15+2 - (9+14+20+21)
= 24 - 64
= -40

8)15-3-18+9-3-6+4-34
= 15+9+4-(3+18+3+6+34)
= 28 - 64
= 36

9)-12+5+30+9-27-33+2+24
= 5+30+9+2+24 - (12+27+33)
= 70 - 72
= - 2

10)7-17+29-12-9-5+33-26
= 7+29+33 - (17+12+9+5+26)
= 69 - 69
= 0