Розкласти на множники:
1) x - y - x2
+ y2
2) a2
- 10a + 25 - ab + 5b

(x−y)(1−x−y);(a−5)(a−b−5);

Объяснение:

x−y−x2+y2=x−y−(x2−y2)=x−y−(x−y)(x+y)=(x−y)(1−(x+y))=

=(x-y)(1-x-y);=(x−y)(1−x−y);

2) a^{2}-10a+25-ab+5b=(a-5)^{2}-b(a-5)=(a-5)(a-5-b)=(a-5)(a-b-5);2)a2−10a+25−ab+5b=(a−5)2−b(a−5)=(a−5)(a−5−b)=(a−5)(a−b−5);