5 * 34 * 20 = (5 * 20) * 34 = 100 * 34 = 3 400;
125 * 45 * 8 = (125 * 8) * 45 = 1000 * 45 = 45 000;
564 * 65 + 564 * 35 = 564 * (65 + 35) = 564 * 100 = 56 400;
45 * 121 - 45 * 111 = 45 * (121 - 111) = 45 * 10 = 450
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