125 - 1 + 2 + 5 = 8
134 - 1 + 3 + 4 = 8
143 - 1 + 4 + 3 = 8
215 - 2 + 1 + 5 = 8
314 - 3 + 1 + 4 = 8
341 - 3 + 4 + 4 = 8
521 - 5 + 2 + 1 = 8
512 - 5 + 1 + 2 = 8
251 - 2 + 5 + 1
и т.д.
<span>5см 4мм - 2мм 7мм = 2см 7мм</span>
(5 2/9у+3 1/3)*3-7 2/3 = 15 6/9y+10-7 2/3 = 15 6/9y+2 1/3
1) при y = 3 1/8, то 15 6/9*3 1/8+2 1/3 = 48 23/24+2 8/24 = 51 7/24