Ngô Quốc Anh

September 7, 2007

Giới hạn kép

Filed under: Giải Tích 3 — Ngô Quốc Anh @ 22:55

Đề bài. Tính các giới hạn kép sau đây

\lim_{(x,y,z)\to(0,0,0)}\;\;\frac{x+y+z}{x^{2}+y^{2}+z^{2}} 

\lim_{(x,y,z)\to(0,0,0)}\;\;\frac{xy+yz+zx}{x^{2}+y^{2}+z^{2}}

\lim_{(x,y,z)\to(0,0,0)}\;\;\frac{xyz}{x^{2}+y^{2}+z^{2}}

Lời giải. ..

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