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, (4.1)

M N - , . f(x,y) k, t . , , .. ; ; - .

(4.1) :

.

.

k ,

-

. , - (4.1).

4.1. .

M(x,y)=x(x+2y), N(x,y)=x2-y2. , M N . y=zx; : .

, ,

. , =( ), , , :

. 4.2.

M=y N=y-x . : y=zx, ,

, , , , :

, , .

 

4.3. .

, .. , : .

. y=zx, ,

,

, , , , , , 0+, =1 - .



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