292
2012-01-11 21:05:00
2
1)
43-25 = 18
(43-25)*100 = 1800,
2)
50-43 = 7
(50-43)^2 = 49
50^2 - 2*50*43 + 43^2 = 49,
3)
(43-25)*100 = 1800
50^2 - 2*50*43 + 43^2 = 49
+)____________________________
43*100 - 25*100 + 50^2 -2*50*43 +43^2
------ --------
------ -----
==> 43^2 = 1849
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