Question

afla produsul dintre nr. naturale de doua cifre care au produsul dintre cifre egal cu 3;5;7

Answer 1

13x31x15x51x17x71=
403x15x51x17x71=
6045x51x17x71=
308295x17x71=
5241015x71=372112065

Answer 2

13*13=169.......unde .....1*3=3...si ...1*3=3
13*31=403.....................1*3=3          3*1=3
31*31=961.....................3*1=3          3*1=3

15*15=225.....................1*5=5
15*51=765
51*51=2601

17*17=289.....................1*7=7
17*71=1207
71*71=5041