Выполнить действия: 1) (2 2/3 + 5/6)* 2 8/21; 2) (2,5+ 1 2/3)* ( 3 1/3 - 1 14/15). ! )

1) (2 2/3 + 5/6)* 2 8/21 = (2 4/6 + 5/6) * 2 8/21 = 2 9/6 * 2 8/21 = 21/6 * 50/21 =  25/3 = 8 1/3;

2) (2,5+ 1 2/3) * ( 3 1/3 - 1 14/15) = (2 1/2 + 1 2/3) * (3 5/15 - 1 14/15) = (2 3/6 + 1 4/6) * (2 20/15 - 1 14/15) = 3 7/6 * 1 6/15 = 25/6 * 21/15 = 7/6 = 1 1/6.

N 1
1) 2 2/3 + 5/6 = 2 4/6 + 5/6 = 2 9/6 = 3 3/6 = 3 1/2
2) 3 1/2 • 2 8/21 = 7/2 • 50/21 = 25/3 = 8 1/3
ответ 8 1/3
N 2
1) 2,5 + 1 2/3 = 2 1/2 + 1 2/3 = 2 3/6 + 1 4/6 = 3 7/6 = 4 1/6
2) 3 1/3 - 1 14/15 = 3 5/15 - 1 14/15 = 2 20/15 - 1 14/15 = 1 6/15
3) 4 1/6 • 1 6/15 = 25/6 • 21/15 = 7/6 = 1 1/6 ответ 1 1/6