Question

ОЧЕНЬ СРОЧНО!!!!!!!!!​

Answer 1

Ответ:

1. $a^{2} -6a+9-a*(a-6)= a^{2}-6a+9-a^{2} +6a= -6a+9+6a = 9$

2. $(x+5)^{2} - (x-5)^{2} = 10*2x = 20x$

3. $(z-2)^2+(z-5)^2 * (z+7) = z^2 - 4z+4+z^2 +7z- 5z-35 = 2z^2-2z -31$

4. $1-(2x-1)^2 = 1 - (4x^2 - 4x+1) = 1- 4x^2+4x- 1 = -4x^2+4x$