Question

Fie multimile A={x | x=5·n+7,n€N} si B={y | y =n²,n€N} det elementele multimilor C={x€A | x<30} si D={y€B | 30 <y<100}

Answer 1

x= 5 x 0 +7 = 0+7=7
x= 5 x 1 +7 = 5+7=12
x= 5 x 2+7 =10+7=17
x= 5 x 3+7 = 15+7=22
x= 5 x 4+7 =20+7=27

C = {7;12;17;22;27}

6²=36
7²=49
8²=64
9²=81

D= {36,49,64,81}