Реши задачи сколько будет 29×28×26÷2

29 × 28 × 26 ÷ 2 = ( 20 + 9 ) × 28 × 26 ÷ 2 =( 20 × 28 + 28 * 9 ) × 26 ÷ 2 = ( 20 * 20 +20 * 8 + 20 * 9 + 8 * 9) * 26 / 2 = ( 400 + 160 + 180 + 72) * 26 / 2 = ( 400 + 160 + 180 + 72) * 26 / 2 = ( 600 + 140 + 72) / 26 / 2 = ( 700 + 40 + 72 ) * 26 / 2 = ( 700 + 100 + 12 ) * 26 / 2 = ( 800 + 12 ) * 26 / 2 = ( 800 + 12 ) / 13 * 2 / 2 = ( 800 + 12 ) / 13 * 1 / 1 = ( 800 + 12 ) * 13 = 800 * 13 + 12 * 13 = 800 * 10 + 800 * 3 + 10 * 13 + 2 * 13 = 8 000 + 2400 + 130 + 26 = 10 400 + 156 = 10 556.В итоге получили, 29 × 28 × 26 ÷ 2 = 10 556.