Решение:
3
16y^2 - 0,25 = (4y - 0,5)(4y+0,5)
a^2 + 10 ab + 25b^2 = (a +5b)^2
4
( 5 - x)^2 - x(2,5 + x) = 0
25 - 10x + x^2 - 2,5x - x^2 = 0
- 12,5x + 25 = 0 | (- 1)
12,5x - 25 = 0
12,5x = 25
x = 25/12,5
x = 2
5
(2a - b^2)(2a+b^2) = 4a^2 - b^4
(x-6x^3)^2 = x^2 - 12x^3 + 36x^6
(y + b)^2 (y - b)^2 = (y^2 - b^2)^2 = y^2 - 2yb^2 + b^4
6
1/81 * a^2 - 0,09c^4 = (1/9 * a - 0,3)(1/9 *a +0,3)
(b+8)^2 - 4b^2 = ((b+8) - 4b)((b+8) - 4b)
a^9 - b^3 = (a^3)^3 - b^3 = ((a^3 - b)((a^3)^2) + (a^3)b + b^2)