如果a-1\a=3,求a²+1\a²的值 速求啊,答得好多给!
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如果a-1\a=3,求a²+1\a²的值 速求啊,答得好多给!
如果a-1\a=3,求a²+1\a²的值 速求啊,答得好多给!
如果a-1\a=3,求a²+1\a²的值 速求啊,答得好多给!
a-1/a=3
两边平方得
(a-1/a)²=3²
a²-2+1/a²=9
∴a²+1/a²=11
a-1\a=3
则(a-1\a)^2=9
a^2-2+1/a^2=9
a^2+1/a^2=11
a-1\a=3
两边平方得
a²-2+1/a²=9
∴a²+1/a²=11