(1)
(6-2 1/10*2 1/7)*4/15 = 2/5
1) 2 1/10 * 2 1/7 = 21/10 * 15/7 = 9/2 = 4,5
2) 6 - 4,5 = 1,5
3) 1,5 * 4/15 = 15/10 * 4/15 = 2/5
ответ: 2/5
(2)
(2 2/3-2 2/9)*(2-1 1/2) = 2/9
1) 2 2/3 - 2 2/9 = 2 6/9 - 2 2/9 = 4/9
2) 2 - 1 1/2 = 1/2
3) 4/9 * 1/2 = 2/9
ответ: 2/9