1又2份1-5份4+10份7=?

1又2份之1-5份之4+10份之7
=2份 1又2份之1-5份之4+10份之7
=2份3-5份之4+10份之7
=20份之30-20份之16+20份之14
=20份之28
=5份之7
=1又5份之2

or

....1.....4......7
..1--- - --- + -----
....2.....5.....10

...3....4......7
=--- - --- + -----
...2....5.....10

...30......16......14
=------ - ------ + ------
...20......20......20

....30.-.26.+.14
=----------------------
..........20


...28
=------
...20

...7
=----
...5


.....2
=1----
.....5


































































































































































































註:不要see..!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

2007-06-06 20:32:56 補充：
............................................

1又2份1-5份4+10份7
=2份3-5份4+10份7
=10份15-10份8+10份7
=10份14
=5份7
=1又5份2

1又2份1-5份4+10份7
=1.5-0.8+0.7
=1.4
=1又10份4
=1又5份2

(SW)

首先我們把它們通份母吧！變成﹕
1又10分之5-10分之8+10分之7
=1又10分之5-10分之1
=1又5分之2

= 1 2/5 (一又五分二)

1又2份1-5份4+10份7=10 又10份6

1又2份1-5份4+10份7

3 4 7
-- - -- + ---
2 5 10

15 8 7
--- - --- + ---
10 10 10

7 7
--- + ---
10 10

14
---
10
4
1---
10
2
1---
5

1又2份之1 - 5份之4 + 10份之7
=2份之3 - 5份之4 + 10份之7
=10份之15 - 10份之8 + 10份之7
=10份之14
=1又10份之4
=1又5份之2

　１　　　　　１　　　　　７
１－－　－　－－－　＋　－－－
　２　　　　　５　　　　　１０


　　　５　　　　　２　　　　　７
＝１－－－　－　－－－　＋　－－－
　　　１０　　　１０　　　　１０


　　　１４
＝１－－－－
　　　１０


　　　４
＝２－－－－
　　　１０


　　　２
＝２－－－
　　　５

1 1/2 - 4/5 + 7/10
= 1 5/10 - 8/10 + 7/10
= 1 (5-8+7)/10
= 1 4/10
= 1 2/5
(一又五分二)

1.5-0.8+0.7
=1.4