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Ch8-exercise

# Ch8-exercise - 1 2 xy lim x0 x y 1 y0 1 1 = lim 1 1 = 0 x0...

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= + + + = 0 , 0 0 , ) ( ) , ( 2 2 2 2 2 3 2 2 2 2 y x y x y x y x y x f 习习 : 第第 , 2 2 2 y x y x + 2 1 2 2 ) ( 4 1 ) , ( y x y x f + ) 0 , 0 ( 0 ) , ( lim 0 0 f y x f y x = = f 第 (0,0) 第第 ; , 0 ) , 0 ( ) 0 , ( = = y f x f 原原 0 ) 0 , 0 ( ) 0 , 0 ( = = y x f f 原原 第第 (0,0) 第第第第第第第第第 , 第第第第 . 2. 习习 : 第第 第第 第第 第第 第第 第第
= ) 0 , 0 ( f , 0 0 y x 2 2 ) 0 , 0 ( ) ( ) ( y x f + 2 2 2 2 2 ] ) ( ) ( [ ) ( ) ( y x y x + = 0 第第 f 第第 (0,0) 第第第 !

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