Question

2,3,6 si7 va rog repede dau coroana la primu răspuns bun

Answer 1

2) AxB={(a,0),(a,2),(b,0),(b,2),(c,0),(c,2)}
BxA={(0,a),(0,b),(0,c),(2,a),(2,b),(2,c)}
BxB={(0,0),(0,2),(2,0),(2,2)}
3) A={a,b,c}, B={2,1}
4) card(AxB)=20x5=100
card(BxA)=5x20=100
card(AxA)=20x20=400
card(BxB)=5x5=25
6) |x|=1 rezulta x=1 sau x=-1
|x|=0 rezulta x=0
|y|=2 rezulta y=2 sau y=-2
Deci B={(1,2),(1,-2),(-1,2),(-1,-2),(0,2),(0,-2)}
7)A={(1,8),(2,4),(4,2),(8,1)}
B={(-7,-1),(-1,-7),(1,7),(7,1)}