Question

aflati cate numere de doua cifre xy au proprietatea ca cifrele lor x si y. indeplinesc conditia 3y5. < 34x. bara deasupra

Answer 1

315<347
cred ca este corect

Answer 2

3y5<34x cu bara deasupra
300+10y+5<300+40+x
305+10y<340+x
10y-x<340-305
10y-x<35
y=1=>10-x<35=>x=1,2,3,4,5,6,7,8,9
nr sunr 11,21,31,41,51,61,71,81,91
y=2=>20-x<35=>x=1,2,3,4,5,6,7,8,9
nr sunt 12,22,32,42,52,62,72,82,92
y=3=>30-x<35=>x=1,2,3,4,5,6,7,8,9
nr sunt 13,23,33,43,53,63,73,83,93
y=4=>40-x<35=>x=6,7,8,9
nr sunt 64,74,84,94
in total: 31 de numere