Объяснение:
(4+a)^2=16+8a+a^2
(2a+3b)^2=4a^2+6ab+9b^2
a)16+8a+
б)4-4x+1
в)4+12ab+9
г)-6+9
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Объяснение:
(4+a)^2=16+8a+a^2
(2a+3b)^2=4a^2+6ab+9b^2
a)16+8a+
б)4
-4x+1
в)4
+12ab+9
г)
-6
+9