= 3 + 1 7 = 22 7 3.14 = 3 + 1 7 + 1 15 +1 = 355 3.1415929 113

221221221221 136136136136 221000000000 221000000 221000 221 = 136000000000 136000000 136000 221 1000000000 1000000 1000 1 = 136 1000000000 1000000 1000 1 221 100100100 221 13 17 = = = = 136 1001001001 136 8 17 13 8 1 5 8

8 8 1.5 = 5 1 3

282 1 2 [ X + 25 + 125] - 37 - X 5 2 = 282 1 2

3X = 3 4 + 1- a 3 3X = 3 4 - a -1 3 a -1 1 a 6 0 4 3

1000 1000 3 1000 ( ) X + 2 = 2

2

abc abc abc aabc 11

2 2 2 OC = BC OB 2 = 5-4 = 3

8 sin60 = 8 3 2 = 6.8 8 sin45 = 8 2 2 = 5.6

x + p + z = 7 x + p + y = 8 y + p + z = 6 p = 1

x + y =10 x y = 20 y = 5 5 5 + 5 5-5

2 r 90 = 65 360 2 ( r + 1) 90 = 65 360

2 A n + n + 4 = 1000 3m = 33 m = 11 n = 2 A = 100

3 3 30 3 3

x + 2y 100 5x + 2y = 260

3-5 3 = 4 3 2-5 3 = 1 3

S t x + y = 2 S t y x = 2

x = y - b a y = q + q 2 + p 3 3 + q q + p 3 2 3 y x = y b x a

81 9 m 2 = = 36 4

1 R 1 = 2

a + b a b 2 ab a + b ab

2 R 3 R = 6 8 2 90 R 4 2 2 3 = = 0. 382 3 2

1 1 1 + + 9 a b c

x = 7 8 = 0.875

OB DA = CO CD = r DA = 2OB = 2r 2r

a x x = x a a a a a a x = 2 + 4 2 = 5 2 2 x = 5 1 a 2 x a x a x x = a 5 1 2

1 1 1 1 x + x + x + 5 + x + 4 = x 6 12 7 2

k = 3 y = (1 2 3 )a = 2 4 4 1 2 a 2

S = 2 S 3

180-30 AOD = = 75 2

3 4 3 8 4 4 4 4 4 8 S S S S S S S

25 45+ 20 37 = 47 40 c f1 = cd = ef1 e d a f2 = ab = ef2 e d

1 3 2

80 80 y = = ctg30 ctg45 3 1 = 109

1 2 3 2 1 2 3 d d d 2 2 2

1 1 20000 x + x + = x 4 3 4

1 = 0. 083 12

Y = 3 + 3-3

2 5

15 3

3 3 2 r = r 4 2 3 r 2 = 3 = 9 1 r 2

100 = 1% 100000 0

160 150 x + y = 110 11 11

150. 180. 2. 60 x + y + z = 110. 12 12 12

3 2a 2

AA = 2a BB = 2BD = 2( a 2 + b 2 ) CC = 2b DD = 0

AC = 4 2 +8 2 = 80 2 AC = 7 +5 2 = 74 AC = 3 2 2 + 9 = 90

A B C A + B + C 10 + 24 + 40 + 60 A B C 10 + 24 + 40 + 60 = 2 + 3+ 5+ 2 2 3 + 2 2 5 + 2 3 5 2 = ( 2 + 3 + 5) = 2 + 3 + 5