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Determinati A∪B ,A∩B ,A-B si B-A specificand si cardinalul lor;a)A={x,y,z,t} ; B={a,b,x,y}.b) A={m,n,p,} ; B={q,r} ;c) A=={10,20,30,40} ;B=={2x5 ; 3x10 ; 2x10 ; 2x40}
d) A= {nЄN/n x≤7} ; B= {nЄN/n este cifra para} ;
e) A= {nЄN/n=2xp ; pЄN; p≤5 }
B= {mЄN/m=3xq ; qЄN ; q≤3}
f)A={xЄN/m=5x-1≤14} ;B={yЄN/y=x+1 ; xЄN} ;
g) A={xЄN/m=5x≤125} ; B={yЄN/y=5≤4x≤64} ;(la A=....5 puterea x .....la b= ....4 la puterea x)


Răspuns :

Determinati A∪B ,A∩B ,A-B si B-A specificand si cardinalul lor;a)A={x,y,z,t} ; B={a,b,x,y}.AUB={a,b,x,y,z,t}cardAUB=6
A∩B ={x,y}card 
A∩B =2
A-B={x,y,z,t}
cardA-Z=4
B-A={a,b,x,y)
cardB-A=4

b) A={m,n,p,} ; B={q,r} AUB={m,n,p,q,r} au card 5A∩B =Ф card este Ф
A-B={m,n,p] au card 3
B-A={q,r} au card 2
c) A={10,20,30,40} ;B={2x5;3x10 ; 2x10 ; 2x40}B={10,20,30,80}
AUB={10,20,30,40,80} au card=5
A∩B ={10,20,30} au card=3A-B={10,20,30,40}  au card=4
B-A={10,20,30,80} au card=4
e) A= {nЄN/n=2xp ; pЄN; p≤5 }
dam valori lui p care pot fi 0,1,2,3,4,5
A={0,2,4,6,8,10}
q poate lua valorile 0,1,2,3
B= {mЄN/m=3xq ; qЄN ; q≤3}
B={0,3,6,9}
si faci ca mai sus
f)A={xЄN/m=5x-1≤14} ;B={yЄN/y=x+1 ; xЄN} ;
5x-1
≤14
5x≤14+1
x≤15/5
x≤3
A={0,1,2,3}
b={1,2,3,4.....}
g) 5x
≤125
x≤125/5
x≤25
A={0,1,2,3,4,5,6,7,8,9,10,11......25}
B={5,6,7,8,9,10,11,12,......64}
AUB={0,1,2,3,4,5,6.....64}   are card=65
AintersB={5,6,7,8,9,10......25} are card=20
A-B={0,1,2,3,4,5...........25} are card=26
B-A={5,6,7,8,9,......64} are card 59