``
``
``
``
all19
447.46
$2ay+2by+2cy-2a^2-2ab-2ac=$
$=(2ay+2by+2cy)-(+2a^2+2ab+2ac)=$
$=2y(a+b+c)-2a(a+b+c)=$
$=2(a+b+c)(-a+y)$
447.54
$=(x+y)(x-y)-3x-3y+xy^2+y^3=$
$=(x+y)(x-y)-3(x+y)+y^2(x+y)=$
$=(x+y)(x-y-3+y^2)$
447.58
$(a^2-t^2)(2/3a+7/13b)-(t^2-a^2)(4/3a-7/13b)=$
$=(a^2-t^2)(2/3a+7/13b)+(-t^2+a^2)(4/3a-7/13b)=$
$=(a^2-t^2)(6/3a)=$
$=(a^2-t^2)(2a)$
indice - tutti i nodi - modifica - login