27a^2=a^6
=>a=3^(3/4)
a^6=9^b
=>3^(9/2)=9^b
=>b=9/4
(a-1/5b)的平方+(a+1/5b)的平方+2b(a-1/25b)
=2a^2+2b^2/25+2ab-2b^2/25=2a^2+2ab=2根号27+(9/4)*27^(1/4)
27a^2=a^6
=>a=3^(3/4)
a^6=9^b
=>3^(9/2)=9^b
=>b=9/4
(a-1/5b)的平方+(a+1/5b)的平方+2b(a-1/25b)
=2a^2+2b^2/25+2ab-2b^2/25=2a^2+2ab=2根号27+(9/4)*27^(1/4)