a×b + 7 = 31 =
=> a×b = 31-7= 24
{a,b} = {1,24} {2,12},{3,8},{4,6},{6,4},{8,3},{12,2},{1,24}
B) a×b - 30 = 6
a ×b = 6+30= 36
{a,b} = { 1,36} { 2,18} { 3,12} ,{4,9},{6,6} { 12,3} { 18,2}{36,1}
C) 83-80+15= a×b
= 3+ 15 = axb
18 = a x b
{a,b} = { 1,18} {2,9}{3,6}{6,3}{9,2}{18,1}