Question

Fie multimile A=[X/ x=5 imultit cu n plus7,nEN] si B=[y/y=n la puterea2, nEN]. Determinati elementele multimilor C= [xEA/ x mai mic decat 30] si D=[yEB/ 30 mai mic decti y si mai mic decat 100

Answer 1

A={x|x=5n+7,n∈N}
B={y| y=n², n∈N}


C={x∈A;x<30}={5*0+7; 5*1+7,5*2+7;5*3+7;5*4+7}= {7;12;17;22;27}
D={y∈B, 30<y<100}={6²;7²; 8²;9²}={36;49;64;81}

Answer 2

A={x|x=5•n+7, n€N}. A={12,17,22,27,32,...}. B={y|y=n²,n€N}. B={1,2,3,4,5,6,7,8,....}. C={x€A|x<30}. C={12,17,22,27}. D={y€B|30