Question

Разложите на множители:
х(y-z)^2+(z-y)^2
4(m+n)+(m+n)

Answer 1

$x(y-z)^2+(z-y)^2=[, (a-b)^2=(b-a)^2=a^2+b^2-2ab, ]=\\=x(y-z)^2+(y-z)^2=(y-z)^2cdot (x+1)\\\4(m+n)+(m+n)=(m+n)cdot (4+1)=5cdot (m+n)$