Помогите сделать 301:сократить уравнения!

1. 25 - m^2
2. 11 - 16p^2
3. 28m^2 - 4
4. - 9 - m
5. b^2 - 25ab
6. 2xm-9m^2
7. 1 - 6x^2
8. - m^2 - k^2 + 2mk
9. 73y^2 - 149x^2
10. 17m^2 - 19k^2

301) 1) (2m + 5)(5 - 2m) + 3m^2 = 25 - 4m^2 + 3m^2 = 25 - m^2 = (5 - m)(5 + m)
2)10 - (4p - 1)(4p + 1) = 10 - 16p^2 + 1 = 11 - 16p^2
3)3m^2 - (2 - 5m)(5m + 2) = 3m^2 - 4 + 25m^2 = 28m^2 - 4 = 4(7m^2 - 1)
4) (m + 3)(m - 3) - m(m + 1) = m^2 - 9 - m^2 - m = -9 - m
5) (5a + b)(b - 5a) + 25a(a - b) = b^2 - 25a^2 + 25a^2 - 25ab = b(b - 25a)
6) -2x(2x - m) + (2x - 3m)(2x + 3m) = -4x^2 + 2xm + 4x^2 - 9m^2 =  m(2x - 9m) 
7) 10x^2 - (4x - 1)(4x + 1)= 10x^2 - 16x^2 + 1 = 1 - 6x^2 
8) (3m - k)(3m + k) - 2m(5m - k) = 9m^2 - k^2 - 10m^2 + 2mk = 2mk - k^2 - m^2 = -(m^2 - 2mk + k^2) = -(m-k)^2
9) (10x + 3y)(3y - 10x) - (7x - 8y)(7x + 8y) = 9y^2 - 100x^2 - 49x^2 + 64y^2 = 73y^2 - 149x^2
10) (9m - 10k)(9m + 10k) + (9k - 8m)(9k + 8m) = 81m^2 - 100k^2 + 81k^2 - 64m^2 = 17m^2 - 19k^2