формулы сокращенного умножения

(и расписать) 1.      (m+n)(m2-mn+n2)

                                  Ответы:           а)  m3+n3

                                                          б)  m3-n3   

                                                          в)  (m-n)2

2.      (m-3)(m2+3m+9)

                                  Ответы:          а)  m3+3

                                                          б)   m3-3  

                                                          в)   m3-27

3.      (5x+1)(25x2-5x+1)

                                 Ответы:            а) 125x3-1

                                                           б) 125x3+1  

                                                           в)  (5x-1)2

4.      (2+n2)(4-2n2+n4)

                                 Ответы:            а) 8+n6

                                                           б) 8-n6   

                                                           в) 4-n4

5.      (3m+2x2y)(9m2-6mx2y+4x4y2)

                                      Ответы:            а) 27m3+8x6y3

                                                                б) 27m3-8x6y 3 

                                                                в)  3m3+2x6y3  

6.      (5m3-2n2)(25m6+10m3n2+4n4)

                                Ответы:            а)125m6-8n6  

                                                          б)125m9-8n6 

                                                          в)  125m9+8n6

1-а

2-в

3-б

4-а

5-а

6-б

как-то так

здесь уже не распишеш ,а надо знать формулы

1) а; 2)б; 3) (5x) ^3+1^3=125x3+1  ;4)  (2) ^3+(n2)^3= 8+n6; 5) (3m)^3+(2x2y)^3=27m3+8x6y3

6) (5m3)^ 3 - (2n2)^3= 125m9-8n6