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             3758     2007-12-21
1. 2 3 4 5 6 7

-

765 234 531

2. 1 9 =

1 2 3 4 5 6 7 8 9 147 258 369 13994694

3.

13- 4 15-10=5

13- 4 15-10=5

13- 4 15=15

13- 4=1

4=13-1

4=12

=3

4. A

2 A 6 A

2 A 6 A 3 8 32 73 6396 A 7 63 A 8 9 A=8 82 78=6396 A 8

5.

1 H H=1 1 1 9 9 H=1 H=9 9 G+8 1 9 G 3 G=7

F=6 E=5 D=4 C=3 B=2 A=1

6.

1

b a= 1 3 7 9 9 9 9

7.

+ + + + =25

n n-2 n-1 n n+1 n+2

n-2+n-1+n+n+1+n+2=25

5n=25

n=5

3+4+5+6+7=25

8.

=7821

7821 7821

7821=2 17 23 2 17=34 23 2 23=46 17

9.12 4 16 9

9 16 9 12 4 9 9

12 4 9 9 =2

10. 75 3 6 5

75 3 25

75 25 3 5 25 75 25 3 3 2 5 8 38625 75 39675 39675

11. 11 x

x+x=2x x-x=0 x x=1 11 x

x+x=2x

x-x=0

x x=1

2x+0+1=11

2x=10

x=5

x 5

12.

=15 4 1

+ =196 2

= +

1 =15 +4 3

3 2

15 +4+ =196

16 =196-4

16 =192

=12

=12 2

+12=196

=184

13. 300 =a d262 =c d205 =b d a b c d

300-262=38 262-205=57 38 57 1 19 19 300 262 205 19

14. 1 7 14

7 7

7 6 7

1+6=7 2+5=7 3+4=7

15.

3

4 1 3 10 11 12 13 17 18 19 3 4 14 15 16 14 9 1 4 14 6+4=88 14 7+4=102 9 14 16 5+4=84 16 6+4=100 16 15


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