Решите плиз (2m+3n)^2
(0,6-y)^2
(-2-n)^2

(2m+3n)²=(2m)²+2*2m*3n+(3n)²=4m²+12mn+9n²

(0,6-y)²=(3/5-y)²=9/25-6/5y+y²

(-2-n)²=4+4n+n²=n²+4n+4