4 00 4 4

.4 0 8 A 6 B 4

7 4 6 8

08 7 0 4 4 6 0 9

4 6 8 00 6 0

6 9 0 4 4.

8 6 0 8. 7

4

6 7

4

8 4 - = 0 ( ) = ( ) = ( ) =

+ +... + 97 99 + + +... + 4 99 00 + +... + 99 0 4 + +... + 4 4 7 00 0 7 = 7 8 9

4 9 6 6 49 =? 64 8 A B = 4 99 4 99 4 6 0 7 4 8 6 4 44 + +... + + 4 4 4 4

7 4 6 7 7 + + + 4 +... + + + + + + + + + +... + 99 + 00 =? ( ) 87 + ( ) ( ) = 00 ( ) ( )

abcdef a = d b = e c = f 7

= 4 π π R d 6 =

7 7 7 7 7 7 7 0

` 7 4 7

4 6

( 8 + 76) 0 = 40 - - 4 = 80 80 = 48 80-48 =

00 00 + = 4 - = 9 4 4 4 4 = 4 4 + = 4 4 8 = 4 8 + = 8 8 6-8 = 6

9 x0 = 0 0000 x = 997 0000 x 997 0000 x x + =.4.4 + =.4 =. 8 = 0.9 x = 0- x 8 x = 4-8 x x = 4 40 A = 8 B ( ) 4 = ( ) = ( + ) = 8

00 - + + = 4 ( ) ( ) 0 0 7 = ( ) 0 0 0 7 = 7 4 4 7 7 4 = 7 7 7 4 7 7 =

+ x + = x 6 + x = x 6 = x x = 7 7 4 = = 0 6 0 7 + + = 9 0 0 = 6 8 4 = 4 4 = 4 4 0 - = 80 8 80 = 0 8

8 + 6 - = 80 8 = 6 = 6 = = + 6 = 6 99-99 - = = 7 7 7 9 + = 7 7 7 9 7 08 = 08 = 84 7 9 08 + + + 7 6 4 6 0 = + = 4 4 4 4 4 0 4 0 = 0 = 84 4 0

6 84 = 6 4 6 = 4 4 4 = 08 = 0 6 99 4 = 4 = 4 8 6 4 = 0 4 0 = 4 4 4 = 4 6 8 80-80 -40 = 8 0 8 = 80 0 9 80-40 -80 = 40-0 0 9 = 9 9 0 9 9 9 ( ) = 00 0 0 9

x + 80 - x = 80-40 9 0 9 70 = 6 = 4 8 = 8 8 4 = 00( ) 4 [ + - ] 4 4 = 4 x + 00 - x = 00 8 x = 00 49-4 + - =

+ 4 = 9 6 [- 6-8 - ( 6 + 8 ) ] = 6 8 = 00 4 00-6 + = 40 0 - = = 8 4 4 8 - = 8 = - 4 4 = = 8 4 4 9 = 9 0 6 0 + 0 = 6

+ = 6 0 4-4 = 4 = 4. - = 4 00 - - = 7

00 +00 - - = 0 0-8 - 8 6 = 6 6 = 0. 8-6 0.4 7

.4 - =. 7 0 + + 6 = 0 4 - =.. =

. 8 ( + ) 0.8 +

64 64 + =

7 49 7 49 = 7 7 + - = 48 7 6 7 48 + 48 = 48 + 8 = 6 6

( +) + + + 4 + + + 4 4 + + 4 + + + 6 + 4 4 + + + 6 6 + + 7 + 6 + 4 4 +

+ 6 6 + 8 + + 4 + 4 + 6 6 + 9 4 4 + + 4 4 + 6 0 6 + 4 + + 6 6 + [ 6 + 6] A B =

4 4 4 = 6 64

0 + + + + = 0-4 + + = 46 8 = 4 4 + = 8 8 + = 46 4 + 8 + 46 = 4 80 - - = 0 4 90-0 = 90 4

0 + ( 0 y) AC = y = y 9x x

= 8

= - = - 6 6 = 7 7-9 9 = - = - 8 8 = 7 7-0 0 4 4 4 = - 4 9 9 4 4 4 = 7 7-4 = 9 9 - = 8 8 - x + x + x + x + = 00 4 x = 00 4 x = 99 4 x = 99 4 x = 6 + + = - + = + + =

+ +... + 97 99 = + +... + 97 99 = + + + ( ) ( )... ( ) 97 99 = 99 49 = 99 0 + 7 700000 + = 700000 0 7

8 9 6 6 8 7 ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 4 9 6 6 40 60 8 8 4 48 6 80 = 4 9 6 6 49 64 8 4 4 6 7 6 8 7 9 8 = 4 4 6 6 7 7 8 8 0 9 9 0 = 9 = 9

- = = 6 6666669-4 = 4 = 6 6666668 6 6 6666669 6666668 4 99 - - - - - 4 4 990 99 99 [ - - - - - - - - 4 4 - ] 990 99 99 [- - + - + 4-4 + -...- 990 + 99 ] = 99 99

4 6 = = = 0 0 = = 0 0 40 7 + = 4 + = 9 6 + = 9 += 6 4 8 64 + = 8 6 + CBA A + B + C 0

= - + - + - 4 + - 4 9 + 9 = - - + - + - + 4 8 9 9 6 0 0 4 6 7 9 = + + + + + 4 4 00 0 [ - + + + + 4 4 ] 00 0 [ ] 0 = - 0 = 99 0 ( 4) 87 ( ) ( ) 00 ( 90) ( 6) 6 4 7 0

ahcdef abc 000 def abc 000 + 00 abc = 7 abc

a a a b = a b = a b BC H BC h = BC h BC H

4 = 0. (.4 6.8

+ = 4 = 4 = 8 9 ( - 8 9 = 9 64 = 8 4 = 8 8 6 = 8 4 4 6 = 8

60 0 4 0 0 8 0 40 0 6 0 0 0 0 4 0 0 0 4 4 0 0 6 0 0 4 0 0 8 0 4 6 0 0.4 8 8.4 70 70 70 6

.4 8970 8970 8970 6

6( 6 + 4 4 + = 0 4 - - 6 - - 7 9 = 9 84

[ ( ) ] = - - 7 - = l = 4 4 - = 4 4 4 = 8 = 8( 8 8 x + x x + l x x x l

x x + 4 6 4 7 = 4. = ( ) 4 7 7 ( 7 4 ) 9 = 7 40

00-76 76-96 96 - + 996 996 - + = 496 496 - + x x x - x 70 0 70 - x 0x x = 6 0 48 6 48 x x + = 0 70 x = 48 8

x + x + x + + x += 00 4 4 x = 99 x x x x 4 x x x + + = 6 4 00 x 4x + = 00 4 x x = 00 x 00 x 00 - x 6 6 00 x x x 6 x = ( 00 x) 00 x x

+ + + + 4 4 6

. 00 4 4. = + A B A B A B P + Q.P Q P * Q * 6 * 8. 600 + + +

0 60

4. + + + + 4 4 6 = ( + )( ) + ( ) + ( ) + ( ) 4 4 6 = = 6 6.8.7 00 700 4