1、(1)=(0.25x-0.25)(0.25x+0.25)=(0.25x)^2-0.25^2
(2)=-(7x^3y+3b^2)(7x^y-3b^2)=-49x^6y^2+9b^4
(3)= 9x^2-y^2+y(x+y)= 9x^2+yx
(4)=(x^2-4)(16+x^4)(2+x)(4+x^2)=(x^4-16)(16+x^4)=x^8-256
2、(1)=40+1/3+2/3+39=40+1+39=40+40=80
(2)=3×5×17×[(2^2)^4+1]=3×5×17×[(4^2)^2+1]=3×5×17×(16^2+1)=3×5×17×255
=255×255=255^2