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1. $ab - 5a$.
3. $12xyz - 9x^{2}y^{2}$.
5. $6pq^{3} + 15p^{3}q$.
7. $- 3ab + 6abx - 9aby$.
9. $(x - y)^{2} + y(y - x)$.
11. $4(x - y)^{3} - 6(y - x)^{2}$.
2. $2x^{3} + 6x^{2}y$.
4. $8m^{2}n + 2mn$.
6. $- 4x^{2} + 8ax + 2x$.
8. $(x - 1)^{2} + 3(x - 1)$.
10. $a(a - b) - 2b(b - a)$.
12. $(a + 3b)(a - 2b) + (a + 3b)(3a - 4b)$.
3. $12xyz - 9x^{2}y^{2}$.
5. $6pq^{3} + 15p^{3}q$.
7. $- 3ab + 6abx - 9aby$.
9. $(x - y)^{2} + y(y - x)$.
11. $4(x - y)^{3} - 6(y - x)^{2}$.
2. $2x^{3} + 6x^{2}y$.
4. $8m^{2}n + 2mn$.
6. $- 4x^{2} + 8ax + 2x$.
8. $(x - 1)^{2} + 3(x - 1)$.
10. $a(a - b) - 2b(b - a)$.
12. $(a + 3b)(a - 2b) + (a + 3b)(3a - 4b)$.
答案：
$1.a(b - 5). 2.2x^{2}(x + 3y). 3.3xy(4z - 3xy).$
$4.2mn(4m + 1). 5.3pq(2q^{2} + 5p^{2}).$
6.-2x(2x - 4a - 1). 7.-3ab(1 - 2x + 3y).
8.(x - 1)(x + 2). 9.(y - x)(2y - x).
$10.(a - b)(a + 2b). 11.2(x - y)^{2}(2x - 2y - 3).$
12.2(a + 3b)(2a - 3b).
$4.2mn(4m + 1). 5.3pq(2q^{2} + 5p^{2}).$
6.-2x(2x - 4a - 1). 7.-3ab(1 - 2x + 3y).
8.(x - 1)(x + 2). 9.(y - x)(2y - x).
$10.(a - b)(a + 2b). 11.2(x - y)^{2}(2x - 2y - 3).$
12.2(a + 3b)(2a - 3b).
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