Ответ:
Объяснение:
- a² - ab - b² =
= - - - =
= =
=
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)
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Answers & Comments
Ответ:
Объяснение:
-
a² - 
ab - 
b² =
= -
- 
- 
=
=
=
=
=
=
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)