38 * x, если x = 10, 8, 5;
1) При x = 10:
38 * 10 = 380
2) При x = 8:
38 * 8 = (30 + 8) * 8 = 30 * 8 + 8 * 8 = 240 + 64 = 304
$\snippet{name: op_column, sign: '+', x: '240', y: '64', z: '304'}$
3) При x = 5:
38 * 5 = (30 + 8) * 5 = 30 * 5 + 8 * 5 = 150 + 40 = 190
$\snippet{name: op_column, sign: '+', x: '150', y: '40', z: '190'}$