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             3195     2007-12-21

C

1 2 C 1 3 B C

B 2 A=1 B=1 C 1

C 1

3

3. 21 19 1/4

19 21+19=40

4. 136-73=63 2/9 2 9 9-2=7 63

73- 136-73 9-2 2

=73-9 2=55

136- 136-73 7-2 9

=136-9 9=55

55

5. 1/7 3/5

1/7 6 3/5 2 3/5 6 2 3=6 3/5=3 3/5 3=9/15 9/15 1+8/7+8

7-1=6 5-3=2 6 2=3

8

6. 5/6 1/4 1998 3

5/6= 1/4 =1/4 5/6=3 10 3 10 3 10 13 23 36 59 95 154 249 403 652 3 0 1 1 2 0 2 2 1 0 1 1 2 0 1 1 2 0 2 2 1 8

1998 8=249 6 1998 3 249 6 2

2

a b c

a b c m 28 56 20 n 5 15 21

28 56 20 m 4 5 15 21 n 105

8. 50 1/7 1/3 1/2

1 1-

7 3 2 42

7 3 2 42 42 50

1

9.

1 1/6 1/5

2

3

11 13 17 19

10.

2

3

3A+11B=17 A B A=2 B=1 A+B=2+1=3

A+B 3

5 1/3 5 1/3


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