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=40000+1000+1000+1000
=42025
b. (400-2)x(400-2)
=160000-800-800+4
=158404
(200 +5)²
200² +2.200.5 +5²
40000 +200 +25
42025
2. 398²
(400 -2)²
400² -2.400.2 +2²
160000 -1600 +4
158400 +4
158404