(1+a)2 - 12+2a+a2, (2a+2)2 - 4(a2+a+1), (b+2a)2 - b2+4ab+4a2, (3a+2b)2 - 9a2+12ab+4b2, (2a-2)2 - 4(a2-a+1), (6a-6)2 - 12(3a2-2a+3), (b-2a)2 - b2-4ab+4a2, (6a+6)2 - 12(3a2+2a+3), (1-a)2 - 12-2a+a2, (3a-2b)2 - 9a2-12ab+4b2,

Reguli de calcul prescurtat (a+/-b)2

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