1)a-b=5 , c=2 а>=5, b<5 942, 832, 612, 502 2)a+b=4 ,c=7 a<=4, b<4 407, 317, 137 3)a=3,b-c=6 b>=6, c<4 382, 371, 360 4)ab=6 ,bc=3 a (1, 2, 3, 6), b(1, 2, 3) 613, 231