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. 90
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1. , 30. , 60. , =8.
:
30, 60. 60, 300. 60 - 30 = 300 =. , = , , 300. =2=16. ==16. =+=16+87=24
: 24
2. , 10; 24; 26?
:
26. . 262=676; 242 +102 =576+100=676. , .
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3. 10, 10 . .
:
= , = - 10, = +10. 2 +2 =2.
2 +( 10)2 = ( + 10)2
2 + (2 _ 20 + 100) = 2 + 20 + 100
2 40 = 0. = 0 ( ) = 40
: 40
4. . .
:
, . 2 + 2 = 2. 2 2 = 2; 2 = 2; = .
: + + c =
, : + + = 3 ( +1)
(1+1+ )= 3 ( +1). =
: 3
5. , . .
:
= , = . = . .
:
, , ,
: 10.
6. , , . , 6.
:
; .
= 4. , , . 2 = c ∙ ca 36 = 4, = 9.
: 9