1/2a^2+2+2a+ax+2x
1/2 (a^2 + 4 + 4a) + x(a + 2) =
= 1/2 (a + 2)^2 + (a + 2) x =
= (a + 2) [ 1/2(a + 2) + x ] =
= (a + 2) ( 1/2 a + x + 1 )
@eidosm grazie mille
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