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Problems(2) - Problems(2 1 1 1 x x2 1 2 3,e,e yy x(1 x...

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Problems (2) 一.一一一一一一一一一一一“一一一一”一一一一一一一一一一一一一 . ) 1 ( 1 , , , 1 , 1 , 1 3 3 2 2 x e e x y y x x + [一一一一]p117 1. 2 2 2 y x xy dx dy - = 2. 2 2 y x dx dy xy + = 3. x e y dx dy - = + 4. y xy dx dy + - = 1 2 5. 2 2 x xe xy dx dy - = + 6. 3 ) 1 ( 1 2 x x y dx dy + = + - 一. 一一一一一一一,一一一一,一一一一一一一 , 0 ) , ( ) , ( = dy y x dxN y xd
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