a ) (x2+2xy+y2):(x+y)(x2+2xy+y2):(x+y)
=(x+y)2:(x+y)=(x+y)2:(x+y)
=(x+y)=(x+y)
b ) (125x3+1)(5x+1)(125x3+1)(5x+1)
=[(5x)3+1]:(5x+1)=[(5x)3+1]:(5x+1)
=(5x)2−5x+1=(5x)2−5x+1
=25x2−5x+1=25x2−5x+1
c ) (x2−2xy+y2):(y−x)(x2−2xy+y2):(y−x)
=(x−y)2:[−(x−y)]=(x−y)2:[−(x−y)]
=−(x−y)=−(x−y)
=y−x