235 * 3 = (200 + 30 + 5) * 3 = 200 * 3 + 30 * 3 + 5 * 3 = 600 + 90 + 15 = 705
1456 * 2 = (1000 + 400 + 50 + 6) * 2 = 1000 * 2 + 400 * 2 + 50 * 2 + 6 * 2 = 2000 + 800 + 100 + 12 = 2912
23561 * 4 = (20000 + 3000 + 500 + 60 + 1) * 4 = 20000 * 4 + 3000 * 4 + 500 *• 4 + 60 * 4 + 1 * 4) = 80000 + 12000 + 2000 + 240 + 4 = 94244
<span>132433 * 5 = (100000 + 30000 + 2000 + 400 + 30 + 3) * 5 = 100000 * 5 + 30000 * 5 + 2000 * 5 + 400 * 5 + 30 * 5 + 3 * 5 = 500000 + 150000 + 10000 + 2000 + 150 + 15 = 662165</span>
1)
3/12 + 25/30 = 1/4 + 5/6 = 3/12 + 10/12 = 13/12 = 1 1/12,
2)
10/24 - 21/54 = 5/12 - 7/18 = 15/36 - 14/36 = 1/36,
3)
30/54 + 22/30 = 5/9 + 11/15 = 25/45 + 33/45 = 58/45 = 1 13/45,
4)
28/40 - 10/75 = 7/10 - 2/15 = 21/30 - 4/30 = 17/30,
5)
12/27 + 14/21 = 4/9 + 2/3 = 4/9 + 6/9 = 10/9 = 1 1/9,
6)
14/24 - 15/40 = 7/12 - 3/8 = 14/24 - 9/24 = 5/24,
7)
12/18 - 5/60 = 2/3 - 1/12 = 8/12 - 1/12 = 7/12,
8)
4/24 + 3/36 = 1/6 + 1/12 = 2/12 + 1/12 = 3/12 = 1/4