8a=√(16√2 + 2) - √2
=>
8a +√2 =√(16√2 + 2)
64aa+16√2a+2=16√2+2
=>
2√2aa+a=1
=>
8a^4 =(a-1)^2
=>
a^4+a+1
=(a-1)^2/8 + a+1
=(a+3)^2/9
原式
=a^2 + (a+3)/3
=(4+√2)/4 +(1/3 -√2/4)a
把a带进去就行了,由于此题实在太恶心,小弟坚持不下去了
8a=√(16√2 + 2) - √2
=>
8a +√2 =√(16√2 + 2)
64aa+16√2a+2=16√2+2
=>
2√2aa+a=1
=>
8a^4 =(a-1)^2
=>
a^4+a+1
=(a-1)^2/8 + a+1
=(a+3)^2/9
原式
=a^2 + (a+3)/3
=(4+√2)/4 +(1/3 -√2/4)a
把a带进去就行了,由于此题实在太恶心,小弟坚持不下去了