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________ ________
(ii)
________ ________
(iii)
________ ________
12 22 32 42 52 ( ) 1 2 3 4 5 ( )
34 44 54 64 74 ( ) 2 3 4 5 6 ( )
25 36 47 58 69 ( ) 5 6 7 8 13 ( )
(i)
________ ________
(ii)
________
(i)90 81 72 63 ( )( )
(ii) 
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(i) 
(ii) ![]()
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