`` `` `` ``
449.83
........?..........
449.83 a
$(2a+1)^2-(a-1)^2=
$=3a(a+2)
449.83 b
$(3a-1)^2-(2-a)^2=
$=(2a+1)(4a-3)
indice
-
tutti i nodi
-
modifica
-
login