30-15=15 (фигур)
Ответ: 1 белых фигур осталось на доске.
328: <span>1, 2, 4, 8, 41, 82, 164, 328
240: </span><span>1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, 240
2464: </span><span>1, 2, 4, 7, 8, 11, 14, 16, 22, 28, 32, 44, 56, 77, 88, 112, 154, 176, 224, 308, 352, 616, 1 232, 2 464</span>
356×34=12.104 3,56×3,4=12.104 2)1073×81=86.913 1,073×8,1=8.6913 3)74×625=46.250 0,074×6,25=0,4625