Răspuns :

Explicație pas cu pas:

a) x2=12, 22, 32, 42, 52, 62, 72, 82, 92

b) 2y=20, 21, 22, 23, 24, 25, 26, 27, 28, 29,

c) 1x9=109, 119, 129, 139, 149, 159, 169, 179, 189, 199

d) y19=119, 219, 319, 419, 519, 619, 719, 819, 919