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§ 6.

— . .
:
) ;
) ;
) .
18a5 b² − 14a4 b³ = 2a4 b² (9a − 7b).
, .−ay + by + cy = −y (a − b − c).
:
) , ;
) .
2a + bc + 2b + ac =
= (2a + 2b) + (bc + ac) =
= 2 (a + b) + c (b + a) =
= (a + b) (2 + c).
.25x² − 4y² = (5x − 2y) (5x + 2y).

x² + 16xy + 64y² =
= (x + 8y) (x + 8y) =
= (x + 8y)².

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