Выполните действия (3-k)²(k+3)² (x²-3y)(3y+x²)
(a-b)(a+b)=a²-b² (a-b)²=a²-2ab+b² (3-k)²(k+3)²=(3-k)(3-k)(3+k)(3+k)=( (3-k)(3+k) )( (3-k)(3+k) )=(9-k²)(9-k²)= =(9-k²)²=81-18k²+k⁴ (x²-3y)(3y+x²)=(x²-3y)(x²+3y)=x⁴-9y²