题目内容
先化简,再求值:,其中,是方程的根.
,
解:原式············· 3分
··················· 4分
·························· 5分
是方程的根,
·························· 6分
··························· 8分
原式 9分
先通分,约分,化简分式,然后把关于a的方程变形为,即可求解
··················· 4分
·························· 5分
是方程的根,
·························· 6分
··························· 8分
原式 9分
先通分,约分,化简分式,然后把关于a的方程变形为,即可求解
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