1) = 4/15 + 4/3 = 4/15 + 20/15 = 24/15 = 1ц.9/15 = 1ц.3/5
2) = 1/2 - 1/3 = 3/6 - 2/6 = 1/6
3) = 3/4 + 13/4 = 16/4 = 4
4) = 5/2 + 11/8 = 20/8 + 11/8 = 31/8 = 3ц.7/8
5) = 49/25 + 3/8 = (49*8)/200 + (3*25)/200 = 392/200+75/200= 467/200 =
= 2ц.67/200
6) = 7/3:14/9 -5/6 = 3/2 - 5/6 = 9/6 - 5/6 = 4/6 = 2/3
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Первые числа в примерах - результат умножения (1) и 2)) примеры или деления в 3) ; 4); 5); примерах.