數學~~~F.1向數

數學~~~F.1向數
1. (+3)+(+1)= 4

2. (+5)+(-1)= 4

3. (+13)+(+2)= 15

4. (-2)-(+8)= 6

5. (-3)-(-3)= 0

6. (+6)+(-8)-2= -4
7. (-9)-4+(-3)= -16
8. (-12)+7-(-5)= 0

9. (+23)+(-18)-16= -16

10. (+4)x(+3)= 12

11. (+8)x(-5)= -40

12. (-6)x(-11)= 66

13. (+2)x(-3)x(+4)= -24

14. (+42)/(-6)= -7

15. (-48)/(+16)=-3
16. (-120)/(-24)=5

17. (+3)x(-4)/(+6)= -2

18 (-25)/(-12.5)/(+2)=1
19. [(-5)+4]x(-13)= 13

20. (+81)/[(-30)+3]= -3

21. [(-24)+3]/[(+9)+(-2)]= -3

22. [5.4+(+1.8)+(-0.6)]/(-0.6)=-11

1.(+3)+(+1)
= 4 <-----正正得正

2.(+5)+(-1)
=5-1 <-----正負得負
=4

3. (+13)+(+2)
=15

4.(-2)-(+8)
=(-2)-8
=-10

5. (-3)-(-3)
=(-3)+3 <-----負負得正
=0

6. (+6)+(-8)-2
=6-8-2
=-4

7. (-9)-4+(-3)
=(-9)-4-3
=-16

8. (-12)+7-(-5)
=(-12)+7+5
=0

9. (+23)+(-18)-16
=23-18-16
=-11

10. (+4)x(+3)
=4x3
=12 <-----2個都是正數,所以答案也是正數。

11. (+8)x(-5)
=-40 <-----先計算8x5=40,因為1個是正數,1個是負數,所以答案是-40。

12. (-6)x(-11)
=6x11
=66

13. (+2)x(-3)x(+4)
=(-6)x(+4)
=-24

14. (+42)÷(-6)
=-7 <-----除和乘的道理一樣。先計算42÷6=7,正負得負,答案是-7。

15. (-48)÷(+16)
=-3

16. (-120)÷(-24)
=5

17. (+3)x(-4)÷(+6)
=(-12)÷(+6)
=-2

18 (-25)÷(-12.5)÷(+2)
=(+2)÷(+2)
=1

19. [(-5)+4]x(-13)
=(-1)x(-13)
=13

20. (+81)÷[(-30)+3]
=(+81)÷(-27)
=-3

21. [(-24)+3]÷[(+9)+(-2)]
=(-21)÷(+7)
=-3

22. [5.4+(+1.8)+(-0.6)]÷(-0.6)
=[(+3.6)+(-0.6)]÷(-0.6)
=(+3)÷(-0.6)
=-5



我今年升P.6炸...
選我做最佳la~~~
plz!!!

1.4 13.-7
2.4 14.-3
3.15 15.5
4.-10 16.-2
5.0 17.4
6.-4

7.-16
8.0
9.12
10.-40
11.66
12.-24

1. (+3)+(+1)= +4

2. (+5)+(-1)= +4

3. (+13)+(+2)= +15

4. (-2)-(+8)= -10

5. (-3)-(-3)= 0

6. (+6)+(-8)-2= +22

7. (-9)-4+(-3)= +33

8. (-12)+7-(-5)= 0

9. (+23)+(-18)-16= -11

10. (+4)x(+3)= +12

11. (+8)x(-5)= -40

12. (-6)x(-11)= +66

13. (+2)x(-3)x(+4)= -24

14. (+42)/(-6)= -7

15. (-48)/(+16)= -3

16. (-120)/(-24)= +5

17. (+3)x(-4)/(+6)= -2

18 (-25)/(-12.5)/(+2)= +1

19. [(-5)+4]x(-13)= +13

20. (+81)/[(-30)+3]= 3

21. [(-24)+3]/[(+9)+(-2)]= -3

22. [5.4+(+1.8)+(-0.6)]/(-0.6)= -11