So m = 20 1 1? +20 1 1? ×20 12? +20 12? =x？ +x？ ×y？ +y？

=x？ +x？ y？ +y？

=(x？ -2xy+y？ )+(x？ y？ +2xy+ 1)- 1

=(x-y)？ +(xy+ 1)？ - 1

=(20 1 1-20 12)? +(xy+ 1)？ - 1

= 1- 1+(20 1 1×20 12+ 1)?

=(20 1 1×20 12+ 1)?

∴m is a complete square.

(1) shows that this polynomial can be divisible by (x-2); (x-2) can be equal to 0; That is, x can be equal to 2.

(2)M is a multiple of the algebraic expression (x-k), and x can be equal to k.

Answer finished, hope to adopt, thank you.