Question

1 , 2 - разложить на множители

3 , 4   5 - сократить дробь 

 

Answer 1

x^2 - d^2 = (x + d)(x - d)

20 kz^2 - 5k + 2z + 1 = 5k(4z^2 - 1) + (2z + 1) = 5k(2z + 1)(2z - 1) + (2z + 1) =
= [ 5k(2z - 1) + 1] (2z +1)

3x(x^2 + y^2)  /  6y(x^2 + y^2) = x / 2y

5k - 2l / (5k + 2l)(5k - 2l) = 1 / (5k = 2l)

5 + 2m / (5 + 2m)(25 - 10m + 4m^2)