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130892 +157852 ()
157852 1 92 130892
130892 +157852 . 5 52
.6 1+5 = 6
. (1+ 2 + 3 + 4 + ... +50)3 ()
1+ 2 + 3 + ... + 50 = 50 × 51 = 25× 51 .5
2
53 = 125
(1+ 2 + 3 + ...+ 50)3
.5
.
. 20092012 ()
20092 . 9 2009
. 9 1×9 = 9 20093 . 1 92 = 81
.1 9×9 = 81 20094
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