Question

Помогите срочноо плиз

Answer 1

Ответ:

Объяснение:

- $\frac{2}{9}$a² - $\frac{4}{9}$ab - $\frac{2}{9}$b² =

= - $\frac{2a²}{9}$ - $\frac{4ab}{9}$ - $\frac{2b²}{9}$ =

= $\frac{-2a^{2} -4ab-2b^{2} }{9}$ =

= $\frac{-(2a^{2} +4ab+2b^{2}) }{9}$  =

= $\frac{-(\sqrt{2} a-\sqrt{2}b)^{2}  }{9}$

5x(3-y)-9+3y= 5x·3 + 5x·(-y) - 9 +3y = 15x-5xy-9 + 3y = (15x-5xy) +(9-3y) =

= 5x(3-y) + 3(3-y) = (5x+3)(3-y)

a³-5a²-a+5= (a³-a) - (5a²-5) = a(a²-1) - 5(a²-1) = (a-5)(a²-1) = (a-5)(a-1)(a+1)