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1. 5x+10
2. 18y-24
3. 14m+21n
4. 2ac+5bc
5. 18ab+8a2
6. -10x2+6xy
7. -6a+8b-10c
8. x5+x4-2x3
9. -15y8-20y7+5y6
10. 8a5-20a4-12a3
11. -8z8+4z5-20z4
12. -24x8y2+30x3y6
13. an+5-a3*3n-1
14. 12x2n+1-8xn+8
15. Y3n+1-yn+5

6.

1.x²-x-62.
2. 10x²+22x+4
3. -6b-4
4. 8y²-26y+15
5. 6a²-a-12
6. 35z²-29z+6
7. 12x²-10x+2
8. -10x²+13x+3
9. 12b²+bc-20c
10. 6x²-19xy+10y²
11. 12a⁴-a²b²-20b⁴
12. 7a⁶-6a³b³16b⁶
13. -4z⁴+19z²+5
14. 20y⁶-22y³+6
15. -60x⁶+43x⁵+4x⁴

7.

1.a⁶
2. x⁸
3. -y¹²
4. x²⁰
5. -c⁴
6. x²¹
7. -y⁴⁵
8. b¹²
9. b3n
10. y5k
11. x16n
12. a4k-4
13. -b12n
14. x12k
15. a6n+3

8.

1. 5
2. -a
3. 30
4. 4z
5. 6m
6. 2a
7. -5y
8. 7/2ab²c²
9. -4y
10. -3m²n²
11. a³
12. x⁴
13. y⁵
14. p
15. -x³16. y

9.

1. m²+2mn+n²
2. p²-2pq+a²
3. c²-2cd+d²
4. 24+8a+a²
5. 9-18b+b²
6. x²+10x+25
7. x²+2x+1
8. 9a²-18b+b²
9. 25z²+10t+t²
10. a²-8a+16
11. 9x²-12xy+4y²
12. 12a²-48ab+16b²
13. x⁴+2x²y+y²
14. x⁶+2x³+1
15. x⁴+2x²+1

20

1. (x+y)(a+b)
2. (a+3)(x+y)
3. (x-4)(a+y)
4. (k+m)(m-k)
5. (a-b)(3a-2b)
6. (y+z)(5x-4y)
7. (p-3)(6m+3n)
8. 7(p-q)(3p-3q)
9. (a-b)(x-y)
10. (m-n)(a-b)
11. (y-x)(p+q)
12. (x-3)(2m+5n)
13. -a²bx²+2a²bx-a²b
14. m(a-2)(m-1)
15. (x-3)(5+a)