f (x) 0, :
1) 0,, .. f(0);
2) 0 ();
3) 0, ..
6. ) = 0 ( 1- ).
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) - , .. 3- .
) y = x2 = 0.
y 1_ x 1_ |
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.. .
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.
0 f (x), . .
1- : 0, .
= 0 .
2- : .
= 0 .
:
1. f (x) j () 0, f (x) + j (), f (x) × j () (j () ¹ 0) , 0 .
2. y = f (x) 0 f(x0) > 0, x0, f(x) > 0.
3. y = f (u) u0 f(x0) > 0, u = j () 0, y = f [ j ()] 0 .
y = f (x) , .
:
1. y = f (x) [ a, b ], .
2. y = f (x) [ a, b ], m M.
3. y = f (x) [ a, b ] f(a) f(b) , x Î (a, b) , f (x)=0.
.8.
, , . .
7.
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8.
. , :
9.
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10.
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11.
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12.
0 , ï ï£ 1 ¹0. , - , 0.
13.
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¥ ¥ .
14.
15.
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( ¥) f (x) 1, j () ¥, , 1¥. .
16. .
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.
( ), . →∞ →0, . .. = .
: .