Răspuns:
Ex 1.
X<Y
12,13,14,15,16,17,18,19
23,24,25,26,27,28,29
34,35,36,37,38,39
45,46,47,48,49
56,57,58,59
67,68,69
78,79
89
Ex 2.
32:16+{76-2*[(20+4*5):5]=
2+[74*(40:5)=
2+(74*8)=
2+592 =594
Ex 3.
X:6=c,r
C=r
7:6=1 r 1
14:6=2 r 2
21:6=3 r 3
6*4=24+4=28
28:6=4 r 4
...