F.1數學........

1.(+4)+(+5)
=4+5
=9

2.(-7)+(+16)
=(-7)+(16)
=16-7
=9

3.(-28)+(-7)
=(-28)-(7)
=-(28+7)
=-35

4.(-25)-(-25)
=(-25)+(25)
=0

5.(+125)-(+25)
=125-25
=100

6. 0+(-100)
= -100

7. -5/7 + -12/7
=(-5-12)/7
=-17/7

8. 5 1/3 - 3/4
= 16/3 - 3/4
= [ (16X4)/(3X4) ] - [ (3X3)/(4X3) ]
= (64/12) - (9/12)
= (64-9) / 12
= 55/12
= 4 7/12

9. -2 1/7 - 5/14
= -(15/7) - 5/14
= -(30/14) - 5/14
= (-30-5) / 14
= -35/14
= -5/2
= -2 1/2

10.(+12)x(+8)
= 12x8
= 96

11.(-15)x(-10)
=15x10
=150

12.(-1240)÷(+8)
= - (1240/8)
= -155

13.(-42)(1 2/3)
= - (42) x (5/3)
= - (14x5)
= - 70

14.(-21/18)x(45/-15)
= (7/6) x (3)
= (7/2)
= 3 1/2

15.(-30)÷(-4)x(+2)
= (30/4) x (2)
= (60/4)
= 15

16.(-100)(+12) / (-28)(-20)
= (-1200) / (560)
= - (120/56)
= - (15/7)
= -2 1/7

17. - 15/12÷42/(-9)
= (-15/12) x (-9/42)
= (5/4) x (3/14)
= (5x3)/(4x14)
= 15/56

18.2 3/5÷(- 26/10)
= - (13/5) x (10/26)
= - (13 x 10)/ (5 x 26)
= -1

19.(-16)÷(-8)+(-13)x(+2)
= 2 + (-26)
= -24

20. 7- 1/5÷( - 4/15)+( - 1/2)
= 7 - (1/5) x (-15/4) - 1/2
= 7 + 3/4 - 1/2
= 7 + 3/4 - 2/4
= 7 1/4

21.( - 2/7 + 3/4)x(1/2 - 1/3)
= (- 8/28 + 21/28) x (3/6 - 2/6)
= (13/28) x (1/6)
= (13) / (28x6)
= 13/168

22.3 + [(-2)+ 1/2]x(-7/9)÷(-21/2)
= 3 + [-(4/2) + 1/2 ] x (-7/9) x (-2/21)
= 3 + (-3/2) x (-7/9) x (-2/21)
= 3 - [ (3x7x2) / (2x9x21) ]
= 3 - 1/9
= 2 8/9

1. (+4)+(+5)=4+5=9
2.(-7)+(+16)=-7+16=9
3.(-28)+(-7)=-28-7=-35
4.(-25)-(-25)=-25+25=0
5.(+125)-(+25)=125-25=100
6. 0+(-100)=0-100=-100
7. -5/7 + -12/7-5/7-12/7=-17/7
8. 5 1/3 - 3/4=55/12
9. -2 1/7 - 5/14=-35/14
計算下列各題:
10.(+12)x(+8)=12*8=96
11.(-15)x(-10)=10*15=150
12.(-1240)÷(+8)=-1240*1/8=-155
13.(-42)(1 2/3)=-42*5/3=-70
14.(-21/18)x(45/-15)=-21/18*-45/15=21/6
15.(-30)÷(-4)x(+2)=(-30)/(-8)=-3.75
16.(-100)(+12) / (-28)(-20)=-120/560=3/14
17. - 15/12÷42/(-9)=(15/12)*-9/12=15/56
18.2 3/5÷(- 26/10)=(13/5)*10/-26=1
19.(-16)÷(-8)+(-13)x(+2)=2+(-26)=2-26=-24
20. 7- 1/5÷( - 4/15)+( - 1/2)=7-1/5*15/4-1/2=7-1/4=27/4
21.( - 2/7 + 3/4)x(1/2 - 1/3)=29/28*1/6=29/168
22.3 + [(-2)+ 1/2]x(-7/9)÷(-21/2)=3+3/2*(7/9)/(-21/2)=1/28

1.(+4)+(+5)
=4+5
=9

2.(-7)+(+16)
=-7+16
=9

3.(-28)+(-7)
=-28-7
-35

4.(-25)-(-25)
=-25+25
=0

5.(+125)-(+25)
=125-25
=100

6.0+(-100)
=0-100
=-100

7.-5/7 + -12/7 (-7分之5+ -7分之12)
=-5/7-12/7
=-2又7分之3

8. 5 1/3 - 3/4
=4又12分之7

9.-2 1/7 - 5/14
=-2又2分之1

10.(+12)x(+8)
=96

11.(-15)x(-10)
=150

12.(-1240)÷(+8)
=-155

13.(-42)(1 2/3)
=-70

14.(-21/18)x(45/-15)
=3 1/2

15.(-30)÷(-4)x(+2)
=7.5x2
=15

16.(-100)(+12)-(-18)(-20)
=-100x(+12)+18x(-20)
=-1200+(-360)
=-1200-360
=1560

17.-15/12÷42/(-9)
=15/56

18.2 3/5÷(-26/10)
=-1

19.(-16)÷(-8)+(-13)x(+2)
=2+(-26)
=2-26
=-24

20.7-1/5÷(-4/15)+(-1/2)
=7-(-3/4)-1/2
=7+3/4-1/2
=7 1/4

21.(-2/7+3/4)x(1/2-1/3)
=13/28x1/6
=16/168

22.3+[(-2)+1/2]x(-7/9)÷(-21/2)
=3+(-1 1/2)x(-7/9)÷(-21/2)
=3-1 1/2x(-7/9)÷(-21/2)
=1 1/2x(-7/9)÷(-21/2)
=-1 1/6÷(-21/2)
=1/9

1. (+4)+(+5)
=4+5
=9

2.(-7)+(+16)
=(-7)+16
=16-7
=9

3.(-28)+(-7)
=(-28)-7
= -35

4.(-25)-(-25)
=(-25)+25
=0

5.(+125)-(+25)
=125-25
=100

6. 0+(-100)
=0-100
= -100

7. -5/7 + -12/7
=(-5-12)/7
= -17/7

8. 5 1/3 - 3/4
=(204-9)/12
=195/12
=65/4　(約分）

9. -2 1/7 - 5/14
=(-42-5)/14
= -47/14

計算下列各題:
10.(+12)x(+8)
=12x8
=96

11.(-15)x(-10)
=150

12.(-1240)÷(+8)
= -(1240/8)
= -155

13.(-42)(1 2/3)
=(-14)x12
= -168

14.(-21/18)x(45/-15)
=(-7/2)x(-1)
=7/2

15.(-30)÷(-4)x(+2)
=(-30)/(-8)
=15/4

16.(-100)(+12) / (-28)(-20)
=(-1200)/560
= -672000

17. - 15/12÷42/(-9)
= -5/4 ÷ 14/(-3)
=15/56

18.2 3/5÷(- 26/10)
=23/5 ÷(-13/5)
=115/(-65)
= -23/13

19.(-16)÷(-8)+(-13)x(+2)
=2+(-26)
= -24

20. 7- 1/5÷( - 4/15)+( - 1/2)
=7-(-15/20)+(-1/2)
=7+ 3/4-1/2
=(56+6-4)/8
=58/8

21.( - 2/7 + 3/4)x(1/2 - 1/3)
=[(-8+21)/28]x[(3-2)/6]
=13/28x1/6
=13/168

22.3 + [(-2)+ 1/2]x(-7/9)÷(-21/2)
=3+[(-4+1)/2]x(-7/9)÷(-21/2)
=3+(-3)/2x(-7/9)÷(-21/2)
=3+ (-1/9)
=26/9

2007-01-07 12:46:32 補充：
呢0的數一定要識ga,唔好只係識靠人....!

1. (+4)+(+5)
=4+5
=9
2.(-7)+(+16)
=-7+16
=9
3.(-28)+(-7)
=-28-7
=-35
4.(-25)-(-25)
=-25+25
=0
5.(+125)-(+25)
=125-25
=100
6. 0+(-100)
=0-100
=-100
7. -5/7 + -12/7
-5/7-12/7
=-17/7
8. 5 1/3 - 3/4
=55/12
9. -2 1/7 - 5/14
=-35/14
計算下列各題:
10.(+12)x(+8)
=12*8
=96
11.(-15)x(-10)
=10*15
=150
12.(-1240)÷(+8)
=-1240*1/8
=-155
13.(-42)(1 2/3)
=-42*5/3
=-70
14.(-21/18)x(45/-15)
=-21/18*-45/15
=21/6
15.(-30)÷(-4)x(+2)
=(-30)/(-8)
=-3.75
16.(-100)(+12) / (-28)(-20)
=-120/560
=3/14
17. - 15/12÷42/(-9)
=(15/12)*-9/12
=15/56
18.2 3/5÷(- 26/10)
=(13/5)*10/-26
=1
19.(-16)÷(-8)+(-13)x(+2)
=2+(-26)
=2-26
=-24
20. 7- 1/5÷( - 4/15)+( - 1/2)
=7-1/5*15/4-1/2
=7-1/4
=27/4
21.( - 2/7 + 3/4)x(1/2 - 1/3)
=29/28*1/6
=29/168
22.3 + [(-2)+ 1/2]x(-7/9)÷(-21/2)
=3+3/2*(7/9)/(-21/2)
=1/28

1.(+4)+(+5)
=+4+5
=+9

2.(-7)+(+16)
=-7+16
=-9

3.(-28)+(-7)
=-28-7
=-35

4.(-25)-(-25)
=-25+25
=0

5.(+125)-(+25)
=+125-25
=+120

6. 0+(-100)
=0-100
=-100

7. -5/7 + -12/7
=-5/7-12/7
=-17/7

之後自己計!!

用 cal 機啦大佬 =]