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Matemati~ko spisanie Numerus
K
4
71. 44444 г
19.
. : 4 4 4 4 : 4 16 4 1 19⋅ + − = + − = .72. г .
г 14kg , г
. ?
.
, г .
, 14kg. ,
7kg, г
7⋅3 kg =21 kg.
5 73. г .
г г : 72 kg, 75kg, 76 kg, 77 kg, 78kg, 80 kg,
81kg, 82 kg, 85 kg 86 kg. ?
. . ,
. г , г
. , .
, x , г
(72 75 76 77 78 80 81 82 85 86) : 4 792 : 4 198 x kg= + + + + + + + + + = = . . x , y , z , u , v г
, , , . г,
72 x y+ = , 75 y z+ = , 76 z u+ = , 77u v+ = , 78v x+ = ,
80 x z+ = , 81 y u+ = , 82 z v+ = , 85u x+ = , 86v y+ = .
г 10
4( ) 792 x y z u v+ + + + = .
, 198 x y z u v+ + + + = kg.
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Matemati~ko spisanie Numerus
74. г 1
7, г ,
.
. 1 7 28. -
,
г
. , , -
г.
. , г 28 г
г 3. 28-
2=26, 28-4=24 28-6=22 24 3. , -
г г 4.
,
12. ,
8. , 1 7, 5 3, 2 6
. , 6 7
, 5 7. -, 1, 5 6, г 2, 3 7, ( ).
6 75. 3000, 4000 .
200 240 , г 50 .
?
. 200 240 50
50ab + , (200,240) 1200b = = . ,
1200 50a + , a ∈ 3000 4000
3650.
76. 40, 50 .
г г
г . ?.
4 6. (4,6)=12
12k , k . 40, 50
40<12k <50. k =4, ..
12⋅4=48.
7
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Matemati~ko spisanie Numerus
77. г a b 23 2a b xb
+=
+,
3 28
b y += 8
2 z
a b=
+ .
. 1 xyz = ,
, , x y z
∈
1 x y z
= = = .
, 1 y = 3 2
18
b += , .. 3 2 8b + = .
2b= . г , 1 z = 8 12a b
=+
, ..
2 8a b+ = . 3a = . г
1 x = ( a b ).
, 3a = 2b= .
78. A , B г A
г . г
A B , г 63 .
. A abcd = B dbca= . г A B≠ , г A B
.
A B> г ( )1000 100 10 1000 100 10 999 A B a b c d d b c a a d − = + + + − − − − = − .
63 ,
999 9 111= ⋅ , г ( )7| a d − . 9, 2a d = =
8, 1a d = = . г г .
1. 9, 2a d = = . ( )9 2 9002 10 10bc b c= + +
( )2 9 2009 10 10bc b c= + + , 9002 2009 7 , 9
2 . ( )0 10 10bc b c= + , .. bc 7 ,
9 7 . 0, 7b c= =
7, 0b c= = .
0, 7b c= = 9072 63 144= ⋅ 2079 63 33= ⋅ ,
(144,33) 3 = , г 9072 2079 63 .
, , 7, 0b c= = 9702 63 154= ⋅ 2709 63 43= ⋅
(154,43) 1 = , 9702 2709 .
2. 8, 1a d = = . 8001 1008 63 ,
bc 63 .. 0b c= = 6, 3b c= = .
0b c= = , г 8001 63 127= ⋅ 1008 63 16= ⋅ (127,16) 1 = ,
8001 1008 .
, , 6, 3b c= = , 8631 63 137= ⋅ 1638 63 26= ⋅ (137,26) 1 = , 8631 1638 .
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Matemati~ko spisanie Numerus
A B 9702 A= 2709 B= , 8001 A= 1008 B =
8631 A= 1638 B = .
8 79. г ABCD . г
AB CD , г AC .
ABC ADC P P
∆ ∆= .
. M AB , N CD ,
AC MN O ( ). г г AMO AON
, MO ON = A
. г OMC NOC ,
ACN AMC P P
∆ ∆= .
M AB , N CD AMC MBC
P P∆ ∆
= ACN ANDP P
∆ ∆= ABC ADC
P P∆ ∆
= .
80. г
2 1
101 1 0001 1 00000001 100 001n−
⋅ ⋅ ⋅ ⋅… … .
. 2 1
101 10001 100000001 100 001n
A−
= ⋅ ⋅ ⋅ ⋅… … . г,
г
2 4 8 2(10 1)(10 1)(10 1) (10 1)n
A= + + + ⋅ ⋅ + =…
2 2 4 8 22
1 (10 1)(10 1)(10 1)(10 1) (10 1)10 1
n= − + + + ⋅ ⋅ + =
− …
1
1
4 4 2 2
2
1 1 1(10 1)(10 1) (10 1) (10 1) 9 9 101010 10199 99 99
n n
n
+
+
= − + ⋅ ⋅ + = = − = ⋅ =… … … … .
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Matemati~ko spisanie Numerus
8 _
81.
1 1
1 13 11 14 3... 14
...120132014 12013
2014
1 1
2 1+ +
+ +
+
+
+
+ ++
.
114...
120132014
1
3 x
+
+
+=
1 1 11 1
1 21 1 1 1 12 2 2 2 21
1 x
x x
x x x x x x x+ +
+ +
+ +
+ + + + +++ = + = + = = .
, 1 .
82. г
( , ) x y г
2 2 17 7 7 x y x x+ + +
= ⋅ ,
e г -
.
. г 3 3
7 7 x y x+ +
= , 7 1≠ 3 3 x y x+ = + ,
= 2 +3. , = 2 + 3 (
).
,
. OMN ∆ г
(
OM h= г )
0 x 0 y
..2 2 2
h x y = + .
=2 +3,
2 3 y x = + , 2 2 2
(2 3)h x x = + + ,
2 25 12 9h x x = + + . ,
9
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Matemati~ko spisanie Numerus
2 2 2 2 26 6 6 6 95 5 5 5 5
5( 2 ( ) ( ) ) 9 5( )h x x x = + ⋅ + − + = + + . (1)
h
0 x 2
h .
(1) 65
0 x + = , .. 65
x = − . г y
65
32 3
5 y = − ⋅ + = : 6 3
5 5, x y = − = .