9^b=(3^2)^b=3^2b
由27^2=a^6=9^b知,3^6=a^6=3^3b
所以,a=3,b=2.
(a-1/5b)^2+(a+1/5b)^2+2b(a-1/25b)
=2a^2+2/25b^2+2ab-2/25b^2
=2a^2+2ab
=2*3^2+2*3*2
=30
9^b=(3^2)^b=3^2b
由27^2=a^6=9^b知,3^6=a^6=3^3b
所以,a=3,b=2.
(a-1/5b)^2+(a+1/5b)^2+2b(a-1/25b)
=2a^2+2/25b^2+2ab-2/25b^2
=2a^2+2ab
=2*3^2+2*3*2
=30