Verified answer

Объяснение:

а)

[tex]2x { }^{3} - 54y = 2(x {}^{3} - 27y)[/tex]

б)

[tex]z {}^{2} - 6zt + 9t {}^{2} - 3z {}^{2} + 9zt = -2z^{2}+3tz+9t^{2} =\left(2z+3t\right)\left(-z+3t\right) [/tex]