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i. : 1 11 1 0x x

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. . () f, x A , , y, x ( y ), , x . y f x f (x) , y f (x)= .

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f, :

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. :

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2 ; Q(x, y)=0 , x, y . x , y y f (x)= . y f(x) , , , x, , x . 4 3x y 10+ = , x,y . . x . . x, . ! x y, : 1 2x , x A 1 2y y , 1 2x x ,

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2 2x y 10 y 10 x+ = = , x,y . . x y 2y 0 y 10 x 0 x 10 , x ( ,10] , A ( ,10]= .

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,

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f gD x /x D g(x) 2 = +

x x x2

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, , ,

( )f (x) g(x)= . { }f gD x /x D g(x) = x x x .

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