1. f: . , , : 1) f(x)=x4; 2) f(x)=3-x; 3) f(x)=x2-x3; 4) f(x)=x+x3; 5) f(x)=|x|; 6) f(x)=x3+6; 7) x+|x|.
2. L f: LL, . ? ?
3. . ? ?
4. . ?
. card A.
, {(, b), Î, b Î}.
: card AxB=cardA×card B.
1. {1,2}, ={3,4}. .
. ={(1,3),(1,4),(2,3),(2,4)}.
2. , ? ?
. . card (A\B)=cardA\cardB :
1. =Æ, , ={ a,b,c }, B=Æ. \={ a,b,c }, card A=3, card B=0, card (A\B)=3. , card (A\B)= card A - card .
2. £, ={ a,b,c }, B={ a,b }, \B={ }Þ card (A\B)=1, card A - card B=3-2=1.
, card (A\B)= card A - card B. ={ a,b,c }, ={ a,b,c }, \=ÆÞ card (A\B)=0. card A=3, card B=3. card A - card B=3-3=0. , card (A\B)=0. card A - card B.
1. . . 1) ={ a,b,c }, B={ d,t }, 2) A={1,2,3}, B={2,3,6}.
2*. , ? ?
3*. , ? ?
, () .
: m , n , » m+n .
: m , n , m x n .
1. . , ?
|
|
. m , n . m=n=3. , , 9. 18.
2. , 10 ?
. 10 , , , Pn=n! n=10 Þ P10=10!=10×9×8×7×6×5×4×3×2×1=3628800.
3. 15 3 . ?
. . ,
, n=15, k=3. ,
4. 15 3 . ?
. ( ) . .
n=15, k=3. ,
5. , ?
. 10 : - 2, - 3, - 2, - 1, - 1. , , , , . n=10, k1=2, k2=3, k3=2, k4=1, k5=1, k6=1, .
6. , : 1) 3,5,7,9; 2) 0;1;2.
. 1. , 3,5,7,9, (35579 53579), (35795 57733). , 4 5 , .. . , =1024.
2. 0,1,2, 1, 3 (0 ). , =162.
7. . ?
. 5 , , 7. , :
n=5, k=7. =330.