А) (3+а²)² <span>= 9 + 3а + а</span>²
9 + 6a² + a⁴ ≠ 9 + 3a + a²<span>
в) (k-5)</span>² <span>= k</span>² <span>- 10k + 10
k</span>²-10k + 100 ≠ k² - 10k + 10 <span>
с) (х+2у</span>²)² <span>= х</span>²+ 4ху² + 4у⁴
x² + 4xy² + 4y⁴ = x² + 4xy² + 4y⁴<span>
д) </span>16a⁴ - 24a²<span>b +9b</span>²<span> = (8a</span>² <span>+ 3b)</span>²
16a⁴ - 24a²b +9b² ≠ 64a⁴ + 48a²b + 9b²
на картинке...............
А)2х(а-b)+a(a-b)=(a-b)(2x+a)
б)3x+3y-bx-by=3(x+y)-b(x+y)=(x+y)(3-b)
1)=3a^2+6a-a2-6a+9= 2a^2-9
2)=8c+4(1-2c+c^2)=8c+4-8c+4c^2=4+4c^2
3)=a^2-8a+16-6a^2+8a=16-5a
4)=x^2+4x-2x-8-2x-2x^2=-x^2-8
5)=d^2+2d-4d-8-d^2+2d-1=-9