2个回答
2020-06-04
展开全部
a^2+2a-1=0,
(a+1)^2-2=0
(a+1)^2=2
a+1=±√2
a=±√2-1
当a=√2-1时,代入
a^2+1/a^2=(√2-1)^2+1/(√2-1)^2=2
当a=-√2-1时,代入
a^2+1/a^2=(-√2-1)^2+1/(-√2-1)^2=4-2√2
(a+1/a)^2=a^2+1/a^2+2=4或6-2√2
(a+1)^2-2=0
(a+1)^2=2
a+1=±√2
a=±√2-1
当a=√2-1时,代入
a^2+1/a^2=(√2-1)^2+1/(√2-1)^2=2
当a=-√2-1时,代入
a^2+1/a^2=(-√2-1)^2+1/(-√2-1)^2=4-2√2
(a+1/a)^2=a^2+1/a^2+2=4或6-2√2
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