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1) y=f(x) [a;b], 2) (), , (a;b), (a;b) ,

(a;b): f(b)-f(a)= (c)(b-a)

.

1. f(a)=f(b) . (0=0(b-a))

2. f(a)≠f(b). .

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f(a)
f(b)
A
B
L
x
y
f(x) φ() , f(x)-φ() .

L׀׀AB,

φ()=

f()-φ()= f()-0= f()

f(b)-φ(b)=f(b)-f(b)+f(a)=f(a)

g(x)=f(x)- ,

g(a)=f(a)=g(b)

g(x) : [a;b], .. f(x) . (a;b) , ()= ()- . , , ..

(a;b): (c)=0

(c)= ()- =0, .. ...

- .

f(c)
C
B
A
bb
a
c
f(b)-f(a)
b
b-a
a
. A(a,f(a)) B(b,f(b)) y=f(x), , . tg b, .. , .

tg b=tg a. , , , (c,f(c)) , .





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