若lim n->无穷 [ 2n^2/(n+2) - an ]=b,求常数a,b的值 求过程,感谢..
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若lim n->无穷 [ 2n^2/(n+2) - an ]=b,求常数a,b的值 求过程,感谢..
若lim n->无穷 [ 2n^2/(n+2) - an ]=b,求常数a,b的值 求过程,感谢..
若lim n->无穷 [ 2n^2/(n+2) - an ]=b,求常数a,b的值 求过程,感谢..
因为2n^2/(n+2)-an=(2n^2-an^2-2an)/(n+2)->b (n->无穷)
只有a=2(否则趋于无穷大),相应地,b=-4.
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