1. 121a2                   (-121a2 )

2.                 -x3 – 3x2 + 4x – 10 – (3x2 + x2 – 5x + 4)
3.
     3.1 xyz + x5y3z4

     3.2    x2yz + 20x2y2z2

     3.3 81x6yz + x6y4z

     3.4 132x8y2z

4.                 (3a – b)(3a + 4b)

5. (2m + 12n)2                         mn
6.
     6.1 (x2 – 5 – 4x)(2x – 3)

     6.2 (x2 + 5 – 5x)(2x – 3)

     6.3 (x2 + 5 – 4x)(2x + 3)

     6.4 (x2 + 5 – 4x)(2x – 3)

7.                 (4a2 – 2a – 20) ÷ (a + 2)

8.                         (3b2 – 2b – 5) ÷ (b + 1)

9.                     (3x – 2)(9x2 + 6x + 4)

10.        (a – 2)(a2 – 4a + 3)         (a2 – 5a + 6)

พหุนาม21...

  • 1.
    1. 121a2 (-121a2 ) 2. -x3 – 3x2 + 4x – 10 – (3x2 + x2 – 5x + 4) 3. 3.1 xyz + x5y3z4 3.2 x2yz + 20x2y2z2 3.3 81x6yz + x6y4z 3.4 132x8y2z 4. (3a – b)(3a + 4b) 5. (2m + 12n)2 mn 6. 6.1 (x2 – 5 – 4x)(2x – 3) 6.2 (x2 + 5 – 5x)(2x – 3) 6.3 (x2 + 5 – 4x)(2x + 3) 6.4 (x2 + 5 – 4x)(2x – 3) 7. (4a2 – 2a – 20) ÷ (a + 2) 8. (3b2 – 2b – 5) ÷ (b + 1) 9. (3x – 2)(9x2 + 6x + 4) 10. (a – 2)(a2 – 4a + 3) (a2 – 5a + 6)